A warm up is an essential part of your workout. In fact, racing into a workout before a proper warm up can leave you in agony and pain. By gently stretching your muscles before you exercise, you prepare them for higher intensity activity.
Warming up not only helps reduce muscle pain or soreness after exercising, but can also improve your overall performance. A warmed muscle also contracts both more forcefully and relaxes more quickly, which can enhance both speed and strength.