Secure resistance band with your preferred resistance on hamstring machine, behind the bars or on any other heavy weight that could hold it. Lock your feet and keep your hips extended and torso upright. Put resistance band on on your chest under your armpits.
Keeping your hips extended, begin to lower yourself as slowly as possible until you feel you will no longer be able to hold yourself.
At this point, slowly push yourself back into a position you started in using your hamstrings.