1. Begin with your head in its normal upright position.
2. Gently tilt your head sideways, first to the right, then left, front, and back.
3. Hold the stretch in each direction 10 to 15 seconds.
Stretching makes your muscles and joints flexible, preventing injuries, and stopping your muscles from cramping. Flexibility also allows you to move your muscles through their full range of motion. That helps you jump higher, reach further, and run faster.