Here are two ways to help you stretch your inner thighs and hamstrings. It's very important that you remember to keep your back straight. A common mistake is to lean forward with a rounded upper spine, which makes the stretch less effective.
-- Karen Voight
1 Sit on the floor with your legs extended straight in front of you. Place your hands behind you and keep your spine upright as you slide both legs out to the sides as far as they can go. Make sure your toes and knees are facing up toward the ceiling. Inhale as you continue to lift your chest and push out through your heels, pulling your toes backward. Keep your hips on the floor and feel the stretch along the insides of your thighs.