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Besides incurring physical injuries, overtraining can impair your immune system, making your more susceptible to colds and other infections, say Gay Gasper, personal trainer and star of the upcoming Basic Ab Workout for Dummies video. A surplus of sweat can also hinder body improvement.
In terms of lifting weights, a span of 24 to 48 hours between sessions is necessary for muscle tissue to repair itself. Muscles don't get stronger during your workout but during ...