Dynamic stretching is a series of controlled movements that warm up the muscles and prepare them for strenuous activity. These exercises are designed specifically to move a group of muscles or a joint through a challenging movement that repeats. This forces the body and the muscle tissue to activate and prepare for more difficult and strenuous activities. The stretching loosens up your muscles and increases their temperature, which helps them function better under stress. These exercises also can increase your joint range of motion. All of these effects reduce your risk for injury.