Robert F. Kennedy Jr., the U.S. Health Secretary and a well-known fitness enthusiast, has become the center of a new controversy. This time, it is not over policy, but his workout attire. Kennedy was recently spotted hiking up Arizona’s Camelback Mountain in a pair of dark blue jeans on a scorching 107°F day, as reported by The Guardian. Photos of him drenched in sweat while climbing in a T-shirt and jeans quickly went viral, prompting both admiration for his stamina and concern for his sartorial and safety choices.Kennedy, known for his unconventional stances on various health issues, has developed a pattern of working out in jeans. Whether it’s hiking, lifting weights, or even wading into creeks, he seems committed to denim regardless of the activity or weather conditions. While some fans praised his grit, others questioned the health implications of exercising in such restrictive clothing, especially given that the Centers for Disease Control and Prevention (CDC), which falls under his department, advises people to wear "loose, lightweight, light-colored clothing" during extreme heat to avoid heatstroke and other complications.Why Denim Isn’t Built for the GymWhile Kennedy’s denim devotion has captured public attention, fitness experts and health professionals advise caution when it comes to choosing workout attire. Here’s why jeans aren’t the best choice for physical activity:Restricted Range of MotionJeans are typically made from thick, non-stretchy fabric, which can severely limit mobility during exercise. Movements required in activities like squats, lunges, and even basic stretching become difficult, which not only reduces workout effectiveness but may also increase the risk of injury.Personal trainer Justin Kraft, speaking to Newsweek, pointed out that restricting motion can be harmful, especially for those with pre-existing conditions like high blood pressure or sciatica.Low Breathability and OverheatingUnlike moisture-wicking fabrics found in gym wear, denim traps heat and sweat. In hot weather or high-intensity workouts, this lack of breathability can lead to overheating, discomfort, and even heat exhaustion. The Guardian noted that Kennedy hiked during record-breaking Arizona heat, despite warnings from the CDC about dressing appropriately in extreme temperatures.Chafing and Skin IrritationChafing is a common side effect of exercising in jeans. The seams and heavy fabric can rub harshly against the skin, particularly in areas like the inner thighs, leading to painful rashes or abrasions.Not Designed for FunctionalityWhile jeans might offer some resistance, experts say there are better alternatives for those looking to add intensity to workouts. Weighted vests, resistance bands, slam balls, and other functional gear provide added challenge without compromising comfort or safety..