For years, the definition for a "good" cardio session was simple- the more intense, the better. From sprinting to spinning classes, and lately, the HIIT workout, the fitness culture has always emphasized intensity over endurance. But a quiet revolution is brewing—one that's rewriting old notions about endurance, recovery, and performance. It's referred to as Jeffing, and it's nothing new—but its science-supported advantages are catching on with a fresh generation of runners, recreational athletes, and even endurance experts who want to train smarter, not harder.

Created by retired Olympian Jeff Galloway, Jeffing is a formal run-walk system intended to increase endurance, lower the threat of injury, and improve overall running performance. And yet, ironically, despite its effectiveness, the system is seen to feature prominently in marathon training programs, trail running, and even ultra-endurance events. As we redefine good cardio in an age more attentive to burnout and overtraining, Jeffing provides something revolutionary: permission to slow down—to go further.

So why is this hybrid strategy catching on now? And might Jeffing be the sustainable cardio solution that HIIT was never designed to be?

What Is Jeffing?

Named after American Olympian Jeff Galloway, Jeffing is a run-walk approach intended to make running easier, more enjoyable, and surprisingly, more efficient. Galloway, who ran in the 1972 Olympics and has a personal best of 28 minutes in the 10k, came up with this technique to prevent runners from getting injured, keep their stamina, and actually enjoy the experience.

Rather than forcing through tiredness until your posture breaks or you're put out by injury, Jeffing provides for walking breaks at intervals to reboot your muscles and your breathing—offering a perfect approach for newcomers and experienced runners alike.

Let's dispel the myth first: Jeffing does not equate to "quitting" running or compromising on a less efficient workout. Actually, walk-run intervals are an established training mechanism in endurance sports. Trail runners, ultramarathoners, and even top athletes make regular use of walk breaks—particularly when they are running long distances or tackling hills.

No matter if you're training couch to 5K or just training for the next marathon personal record, Jeffing allows you to control heart rate, fine-tune respiratory patterns, and alleviate joint impact but still achieve cardiovascular and muscle training benefits. Intervals at your service , smarter and easier.

One study, reported in the Journal of Science and Medicine in Sport, compared finishers of marathons who employed the run-walk technique with those who ran non-stop. The outcome was dramatic: Jeffers finished the 26.2-mile marathon in essentially the same amount of time as conventional runners (times were 4:14–4:34 for Jeffers vs. 4:07–4:34 for runners).

But here's the kicker—Jeffers reported significantly less muscle pain and fatigue afterward. For anyone concerned about injury prevention or longevity in their running journey, this benefit is hard to ignore.

How Jeffing Works?

Running for long durations is demoralizing—particularly for beginners. The thought of hammering the road continuously for 30, 60, or even 90 minutes is daunting to most. Jeffing eliminates that mental block by incorporating scheduled rest. If your mind is aware that a break is only minutes away, you are more likely to remain excited and plow through the exertion.

Physiologically, walk breaks permit muscles to recover without sacrificing forward motion, decrease total fatigue, and prevent the sort of overuse injuries that befall so many runners. The tactic also provides your cardiovascular system with a break to readjust, enabling more effective energy utilization over greater distances.

How to Start Jeffing?

Starting with Jeffing is remarkably easy—and highly customizable. You can base your run-walk intervals on either time or distance, depending on your goals and fitness level. Here are some popular beginner-friendly examples:

• Run 2 minutes, walk 30 seconds
• Run 1 km, walk 1 minute
• Run 4 minutes, walk 1 minute
• Run 400m, walk 100m

Whether you use a running watch with interval notices or just make timers on your phone, consistency is the rule. And one more thing: Don't delay walking until you're exhausted. Integrate walk breaks from the very start of your exercise to get the maximum benefit.

One of the standout features of Jeffing is its adaptability. Beginners can use it to gradually build endurance, reducing the risk of burnout or discouragement. For advanced runners, Jeffing is a strategic way to tackle longer distances, increase weekly mileage, or recover between high-intensity sessions.

For instance, a person preparing to run a marathon may begin with a 1-minute run/1-minute walk plan, gradually increasing longer run intervals in the process. Ultimately, you might work towards running most of the race while continuing to include strategic walks on hills or at aid stations.

Jeffing vs. HIIT

So how does Jeffing compare to high-octane routines such as HIIT? The reality is, they're not competing. HIIT is great at increasing anaerobic capacity and metabolic rate in short, intense bursts. Jeffing, conversely, prioritizes endurance, joint health, and mental sustainability.

Actually, most runners find that a hybrid system is beneficial—HIIT for brief, intense workouts during the week, and Jeffing for weekend long runs that build endurance and cardiovascular capacity. Whether you're preparing for your first 5K or your fifth ultra-marathon, Jeffing is a science-supported, accessible, and fun way to achieve success.

Exercising is a crucial part of keeping ourselves healthy. Whether it is walking, going to the gym or even working out at the weekends, it is very important for your body. Everybody has their own preferences regarding exercising, while some people find it much better to exercise early, others go for evening exercises.

Research published in the Medicine & Science in Sports & Exercise journal suggests that exercising in the morning could be especially good for the heart and lungs of older adults. The study also found that simply having a regular exercise routine can bring health benefits. Experts explained that getting physical activity earlier, consistently, and more often during the day might help you stay fit as you get older.

What the Study Revealed

To understand how the time we exercise affects our overall fitness and health, scientists looked at health information from 799 older adults (average age 76). Participants wore devices on their wrists for seven days to track their activity. They also underwent tests to check their heart and lung health and had regular doctor visits. Here's what researchers discovered:

• Being most active in the morning (what they called "peak morning activity") was linked to better heart and lung fitness and more efficient walking (meaning the body uses energy better while walking).
• Exercising at the same time each day consistently was connected to better health outcomes.
• People who had regular patterns of rest and activity throughout the day showed better heart and lung fitness and walking efficiency.

Why Exercise Timing Might Matter

There's still a lot to learn about how the timing of our physical activity affects our health and the risk of long-term diseases. More research is definitely needed to fully understand this link.

However, researchers suggested that the connection between exercise and our body's natural circadian clock (our 24-hour internal rhythm) might explain why timing matters. This internal clock controls things like body temperature and hormone release. So, the time of day you're most active could actually impact how well you perform and even how your muscles respond at a very basic level. Depending on the timing, working out could also either shift your internal clock or keep it steady, which seems to help muscle cell function and overall metabolic health.

Lastly, it's worth noting that everyone has a chronotype – whether you naturally feel more awake in the morning, afternoon, or evening. Scientists believe that knowing your chronotype and planning your activities accordingly could significantly impact your health and fitness.

Should You Exercise in the Morning?

The American Heart Association suggests getting 150 minutes of moderate exercise or 75 minutes of vigorous activity per week. But a growing amount of evidence suggests that even short bursts of movement – even just 20 minutes a week – can significantly benefit your heart.

One sports medicine doctor emphasized that any amount of exercise makes a difference and that whether you exercise is more important than when. Another expert agreed, highlighting that having a consistent exercise schedule is also very important. Both the new study and other research show that sticking to a routine offers many benefits, from preventing long-term diseases to improving survival rates with cancer.

Many times, the things we like to do aren’t easy to do. While it may suit other people, there is no guarantee that it is the best for you. So how does one go about looking for the exercises that suit us? How about picking exercises according to your personality?

A recent study published in the Frontiers in Psychology journal suggests that picking your exercise according to the kind of personality you have could be the best idea. The study suggests that if your workout fits your personality, you're more likely to stick with it and see better results.

Researchers mentioned that our personality affects how we respond to and engage with exercise. Think of it from a different perspective, like a person who enjoys talking and having conversations with people, they fair better in jobs that allow more face-to-face interactions. Similarly, this study explains that some aspects of our personality could help us find better results with a certain type of exercise. Understanding ourselves and others can help create personalized fitness plans that lead to lasting changes in how active we are.

How Your Personality Shapes Your Workout Choices

Researchers wanted to make physical activity more enjoyable for people. So, they explored how personality affects what kind of exercise people prefer and how committed they are. They studied 86 individuals over eight weeks. First, participants filled out surveys about their stress levels and personality traits, like how friendly or anxious they tend to be. Then, they underwent fitness tests and were divided into two groups:

• A "resting" group that continued their usual daily activities and did some light stretching each week.
• Another group that performed cycling and strength training at home.

Throughout the study, participants regularly reported how much they enjoyed their exercise sessions.

Finding the Best Workout for Your Personality

The study didn't pinpoint exact exercises for specific personality types, but it did reveal some general patterns connecting what are called the "Big 5" personality traits with workout preferences:

• Extroverts often enjoy intense workouts with other people, like team sports.
• Anxious individuals tend to prefer private workouts with breaks built in.
• Conscientious people generally fit in more physical activity each week and show better overall fitness.
• Agreeable people like to exercise for a while but prefer activities that are less intense.
• Open-minded individuals are willing to try different workouts, but they might rate very strenuous or high-intensity exercises lower than other groups.

It makes a lot of sense that your personality strongly affects your workout preferences. Your traits influence your willingness to try new things, how you feel about effort, and your comfort in different environments, making exercise a natural way for these tendencies to show up.

Experts note that this study was stronger because it used objective measurements rather than just relying on what people reported about themselves, which is common in similar research.

However, the study wasn't perfect. More than 70% of participants were described as open-minded, conscientious, and emotionally stable, meaning the group might not fully represent everyone in the general population. Plus, the study didn't account for participants' past exercise experience or why they chose particular workouts.

Your Fitness Journey, Your Choices

Tailoring your fitness program to your personality could potentially boost your exercise gains and overall health. Finding workouts that people will actually do and stick with is crucial for consistent physical activity.

If you're thinking about trying a new workout, experts suggest reflecting on your own personality traits and the types of activities you usually gravitate toward. It's helpful to pay attention to how you feel after different types of sessions, whether it's a strength workout, yoga, or a run. Ask yourself if it energizes you, calms you down, or just makes you too tired for anything else.

However, it's also important to think about other factors that might help you stick with an exercise routine, such as how easy it is to access, any injuries you might have, and your specific fitness goals.

Being willing to adapt and create a plan that truly works for you will help you achieve more long-term benefits. Setting clear goals that include measurable progress is an excellent way to build towards success.

For beginners, weight exercises may seem tedious and something that will take a long time to show results. Many people also find that sometimes even despite exercising regularly, slow progress can make them feel discouraged, leading them to grow tired of working out. However, research shows that you do not need countless hours of working out, there is a specific point and set of habits that lead to the best results.

A new study, a preprint posted in SportRxiv, reviewed 67 studies to pinpoint what exercise habits led to the best muscle and strength improvements. The findings indicate that while doing more sets in a weightlifting session helps with both muscle strength and growth, there's a point where it stops being as effective.

How Many Sets Are Best Per Workout?

One of the study's authors noted that while there's been much research on how often to train and how many sets to do, fewer studies looked at how to split your activity across different workouts. To find answers, the team analyzed many studies involving thousands of people. They looked at two types of sets:

• Direct sets which are exercises that primarily work a specific muscle.
• Indirect sets are exercises where a muscle is working, but it's not the main focus (counted as "half" a set).

Their analysis showed that muscle and strength generally increased with more sets per session. However, the data also showed a stopping point. Muscle growth leveled off after about 11 indirect sets in a single session. On the other hand Strength gains leveled off after around two direct sets in a single session. This means that the first few sets you do in a workout give you the biggest benefits. More sets do seem to help, but only up to a certain point.

Creating Your Ideal Strength Routine

The study's findings can help people make their workouts more efficient and plan their weight training. For strength, it makes sense to train more often—about two to three times a week—with relatively few sets each time. This approach also works for muscle growth. Alternatively, for muscle growth, you could go to the gym less often but do a few more sets in each session. Even if you're not super strict about your routine, know that regular, moderate strength exercise can have a big positive impact on your health.

Why Fewer Sets Can Lead to More Gains

It might seem strange that doing fewer sets could lead to more strength, but these findings match what earlier research has shown.

Fewer sets with heavier weights have long been known to increase strength by helping you improve your ability to produce force. The initial challenging sets help to use the most muscle fibers and kickstart most of the strength-building processes.

Basically, once you've done one or two hard sets, more sets after that add very little extra benefit. Instead, they add a lot more tiredness and make your recovery time longer. If you train too much over time, you'll feel more tired and won't perform as well, especially when it comes to pure strength.

Using Research to Plan Your Next Workout

Whether you're a fitness enthusiast or just starting, this research can guide you on how to get the most out of your weight training: try focusing on just a few sets, repeated about three times throughout the week.

For beginners, it's suggested to start with fewer sets and add more if you stop seeing results. When it comes to the ideal number of repetitions in each set, it depends on your fitness goals:

• Fewer reps (about 1 to 5) are good for strength and power.
• About 6 to 12 reps are best for building muscle.
• Between 13 and 20 reps are recommended for muscle endurance.
• Make sure to allow enough rest between workouts for the same muscle groups
• It also helps to track your workouts—like how many sets, reps, and what weight you lifted—and adjust based on how your body responds.