Question: When am I exercising to hard?

I think your suppose to breath hard... are you suppose to stop when I am tired of the "burn" or keep going... IDK if this is a bodily signal to stop doing it. Like if I am running. Do I stop when I feel the burn in my legs and stomach. Or keep going until my 30 mins are done... I guess my question is. When am I suppose to take a break?







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