Before starting, please remember to do these within your level of comfort. Start slow!
Butterfly Stretch–Laying Down
Lie on your back with knees bent and place the bottom of your feet together. Next, lower your knees to the side for a stretch to your inner thighs and opening your hips.
Lunge-Hip Flexor Stretch
While keeling, lean forward and bend your front knee until a stretch is felt along the front of the opposite hip. Keep your torso/trunk upright. Repeat on other side.
Piriformis Stretch
While lying on your back with both knees bent, cross right leg over your left knee. Next, hold your left thigh and pull it up towards your chest until a stretch is felt in the buttock. Repeat on other side.
Pictures and information taken from HEP2Go.com