Hitting the gym to achieve a beach-ready body? Experts advise taking it slow and exercising in moderation. Overzealous training can be counterproductive to your overall health, weakening your immune system and increasing risk of injury and illness.

On June 22, renowned health and fitness website FitSugar reported on the top three signs you've hit the gym too hard. Classic symptoms include a a general "worn out" feeling, similar to a cold or flu.