When should I to stretch??
Listen to your body. If you tend to feel stiffness in your low back in the morning, then try doing these stretches right away when you get up or after a shower. If you work a desk job, then try doing these stretches during a break time or at the end of the day. Make a commitment to stretching for a couple minutes each day.
This stretch can be particularly helpful to do if you sit a lot at work or are taking a long car ride. Stand in front of a chair. Bring one leg up so that the heel of your foot is resting on the seat of the chair. With a straight back, open chest and flexed foot slowly start to lean forward until you feel a good stretch in your hamstrings and calf muscles. Hold for a couple seconds and release. You can go in and out of the stretch several times then switch legs.