Pavan Mukta Asana
Method: Lie down supine with your heels together, arms stretched by your sides. Inhale and slowly bend one knee as you raise it. Tuck the knee into your chest, holding and press it with interlocked fingers. Exhaling, straighten the knee bringing the leg on to the floor. Repeat with the other leg. Do this asana a few times alternating the legs. Then bend both the legs together and do the asana in the same manner.
This asana loosens the knee and hip joints addition to curing constipation, acidity and getting rid of gas. But avoid this, especially if you are pregnant.