This stretch helps to promotes optimal posture by keeping the hamstring (rear upper thigh area) flexible.
Begin by standing with your feet shoulder width apart. Step forward with your right leg and then crouch down so that your hands are on the floor in front of you and both legs are bent.
Draw your abdominals inward and tighten
Begin straightening both legs until you feel the stretch.
Hold for 20 seconds, release and switch legs.
Where you should feel it
You should feel this stretch in the back of your thighs (hamstrings).