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Basal Metabolic Rate Explained

Improvement in muscle performance (this means increased strength, control and endurance) comes from stress and recovery.

So should you stop before you “feel the burn?”  Research has shown that to improve muscle strength you shouldn’t. When you work your muscles hard, your body goes to work about eight hours later.  Your cells release cytokines that cause inflammation (and soreness), increased blood flow (redness) and increased fluid flow in the damaged area (causing swelling).  The cells around the damaged area encourage tissue growth to heal the damaged muscle fibers.  Muscle fibers become larger each time, and sometimes grow in number by splitting to create new fibers.

Eventually your muscles will not be as sore from repeating the same old routines.  You may be thinking that this is a great thing, and you are partially right.  Your muscles have grown to the point where they are no longer overworked and therefore damaged with micro-tears from your regular workout routine. If you are happy the way you are, then keep up the routine and revel in the lack of pain.  However, if you are looking to build more muscle or strength you will need to change your routine and yes, face more soreness.