studies, all exercise programs produce substantially fewer benefits than expected. There are two main reasons: First, exercise is known to stimulate appetite. This tendency to eat more after exercise reduces expected weight loss. Second, a formal exercise program tends to decrease non-exercise activity. For example, if you have been doing hard physical labor all day, you are unlikely to come home and run 10 kilometers for fun. On the other hand, if you’ve been sitting in front of the computer all day, that 10-kilometer run might sound pretty good. These compensation effects are a
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