They'll get sore.
Sore muscles are a sign you are over doing it. You should take it easy if you are just starting out, if not let your muscles gradually work out to getting what it is you wish to reach.
When muscles are over-exerted, the muscle cells carry out anaerobic respiration to compensate for the oxygen deficit. Lactic acid produced as a result of this causes muscles to become sore or develop cramps.
Muscles become sore from the lactic acid production being increased from strenuous output of energy on the muscles.
Stretching is a good way to help sore muscles to feel better.
because your muscles are adapting to the workout you did
Your muscles tightening up
Based on past experience alone a good cream to relieve sore muscles is called Deep Heat. It heats up your muscles giving you some relief. This can be purchased over the counter at any local drug store.
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Lactic acid settling in the muscles
Aching is a 6 letter word that describes sore muscles.