"If someone has a common cold, it's common courtesy that he work out at home. Any crowded communal space is a giant petri dish for germs, especially the cold-causing rhinovirus. At gyms, factor in dozens of shared surfaces, damp locker rooms, and towels that stand up on their own-and the place you visit for optimal health may send you to bed for a week." I can attest to that. Since I've stopped going to the gym and instead work out at home I haven't had a cold or the flu in 4 years!
http%3A//www.mensfitness.com/nutrition/gym-flu
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