Muscles are pumped and supplied with a regular blood supply through the workout, energy and power is increased and maintained, fatigue is reduced and so is acidification. During your workout,you will feel more focused, senses will heighten, and you will find clarity to concentrate on attaining the best results through hard exercise. No longer will you feel that uncomfortable after-workout muscle burn. Due to the increase in muscle volume, your metabolic rate will escalate, burning more calories. A blast of high intensity exercise causes a rapid increase in the metabolism of muscle cells.