1
Straighten your spine and try to bring your belly towards your thighs, stopping at the point when your spine begins to curve. Avoid pain and tension in your hamstrings.
2
If you feel too much discomfort in your hamstrings, bend your legs. Make sure your belly is resting on your thighs. Slowly start walking your heels forwards in small increments, eventually until the moment belly is getting off your thighs. Try to stay here with your spine straight and relax here. Avoid pain and tension in your hamstrings.