It doesnt hurt anything really.
I wouldnt have sex or masterbate a couple days before a wrestling tournament because your performance diminishes. Professional Athletes do this as well, I dont know exactly what it does, but you dont get as pumped up. You arent as aggressive.. you really feel too good to perform strenuous feats.
So does it hurt you in anyway? If you're just exersising, no. If you're going to run a marathon, might not want to.
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