Prime Time Boost Make sure to stretch your muscles between sets of exercises. Do the stretch for about 20-30 seconds. Stretching in this way gets prove results. Studies demonstrate strength increases of as much as 20%. Proper stretching is generally agreed to prevent muscle injury before and after a workout. The risks of improper stretching, including stretching in between sets that includes too much intensity in your stretching exercises can increase your risk of injury or soreness. It is very important to consider the different types of stretches and current advice about all stretching so that you can properly perform stretches. http://www.usafullreview.com/prime-time-boost/