Stand with one leg in front of you, and one leg back.
Keeping your back flat, lean on the back leg, keeping the front one straight with
the toes pointing forward. Lean your torso forward as shown in the picture.
Use your hands on your knees for balance. You can also place one hand on the wall
for balance.
You should feel a stretch in the hamstring of the extended leg.
Hold stretch for 20-30 seconds, then repeat with the other leg.
Tips
It is hard for beginners to get in the right position to feel a good stretch doing
this exercise. Make sure to keep the front leg fully extended.