While this was once thought to be true, more recent research suggests that endurance athletes, such as marathoners and triathletes, have a few hours or even days after their events where their RMR is elevated; but for most athletes, the increase in RMR post-exercise is not enough to get excited about.
Even highly trained athletes often have RMR equal to their sedentary counterparts. While exercise is great for total energy expenditure, and is good for your heart and cardiovascular system and has many other health benefits, increasing metabolic rate is not one of the major benefits of exercise.
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Ever since the fitness craze in the 1980’s, we have become a nation increasingly aware of our health and physique. Millions of dollars are spent every year in the quest for a perfect body. Gyms are big business, personal trainers are making a tidy living helping people stay fit, and body building supplements are at an all-time level of performance.