Muscles require little training interval stress to initiate physiological adaptations. Smaller stress increments succeed much, much better than larger stress increments. Athletes should always finish wanting to train more. Athletes train every day. More than thirty-six hours without appropriately stressing desired physiological systems and regression sets in.
Athletes always practice with perfect motor unit contraction and relaxation sequences.
Only perfect practice makes perfect. Therefore, training intervals never fatigue perfect motor unit muscle fibers. When training program designers overload physiological systems with weights, they maintain repetition numbers in fixed time periods and gradually increase weight. When training program designers cannot or do not overload physiological systems with weights, they still maintain repetition numbers, but they decrease time periods. In this way, designers use time as overload.