Stretch after you do your regularly scheduled strength and endurance exercises. If you can't do endurance or strength exercises for some reason, and stretching exercises are the only kind you are able to do, do them at least 3 times a week, for at least 20 minutes each session. Note that stretching exercises, by themselves, don't improve endurance or strength. Do each stretching exercise 3 to 5 times at each session. Slowly stretch into the desired position, as far as possible without pain, and hold the stretch for 10 to 30 seconds. Relax, then repeat, trying to stretch farther. Stretching will increase your ability to perform an activity 10-20% better. The fact that your muscles have been readied by your stretching routine, will allow you to workout or perform some other form of activity pain free in in most cases , and it will certainly reduce the chance of injury. Stretching is vital to your overall well being whether you are young or old, a competitive athlete or someone who wants to walk the dog in the park.