Lie on your belly. Press your forearms against the floor and lift your head and upper torso.
Bend your right knee and bring the heel toward the same-side buttock. Then, supporting yourself on the left forearm, reach back with your right hand and clasp the inside of your foot. As you slowly rotate your elbow toward the ceiling, slide your fingers over the top of the foot and curl them over the toe tips. The base of your palm should be pressing the top of the foot.
To start press your foot toward the buttock; after a while, if you have the flexibility, take the foot slightly off to the side and press it toward the floor. Be sure to keep your knee in line with your hip. Don't push your foot too hard if it hurts your knee.
Square your shoulders with the front of the mat and don't collapse into your left shoulder. Instead, press down with your elbow to lift your chest.
Do Half Bhekasana on each side for the same length of time, 30 seconds to two minutes. Once your thighs and groins open enough, you can try the full pose-both legs at the same time.