Benefit #2: Circulation
Tight muscles are also problematic in the opposite direction of blood flow. If tight muscles slow down blood flow to the muscles, then they also slow down the removal of metabolites. Remember it is in the recovery phase of training that strength adaptation occurs. Nutrients gained via adequate nutrition are transported in the blood to rebuild broken-down tissues and make them stronger. If the muscles are tight, then that will reduce that blood flow during the recovery phase. The result will be less than adequate progress.