While most people have a greater challenge overcoming a sedentary lifestyle, it turns out that the wonderful experience of exercise with all its mental and physical benefits can also be overdone.

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In top athletes, excess physical activity can be harmful, as cases of ‘overtraining syndrome’ suggest. It is associated with major fatigue and reduced athletic performances. A study has now shown that intensive physical training can harm brain capacity, particularly cognitive control. The full results have been published in Current Biology.