Static stretching exercises should be done after a workout to relax your muscles. There are two types of static stretching: active static stretching and passive static stretching.
You are doing active static stretching exercises when the stretching of one muscle is hone with the help of the force of other muscles that sustain the stretched muscle. All active static stretching movements must be hold for at least 20-30 seconds. For every major muscle group you must do two stretching moves.
If you take one of your legs and lift it up in front of you as high as you can putting it on a wall or stool you are doing passive static stretching. Your stretched muscle it maintained in that position by an outside force in this case. You have to do the passive static stretching using slow moves and hold the final position for 20-30 seconds. If you cannot last that long hold the position for as long as you can.
Stretching can help you eliminate stress. You get lots of physical and mental relaxation just by doing some light static stretching exercises. If you do stretching exercises you will also increase your muscle force and the speed of your body. Muscle flexibility and joint mobility are very important for a healthy body. The best thing about stretching is that you can do it anywhere regardless of the time of day.