When you are done with a workout, stretching is very important, so that your muscles can repair themselves  Velofel Pills and rebuild. If you are under 40, hold your stretches for a minimum of 30 seconds. If you are past 40, you should hold it for twice as long. This prevents injuries from occurring when exercising. Know your limitations, and don't stop short of exhausting them. On every set, work your muscles until exhaustion, meaning unable to do another rep.