The butterfly stretch exercise stretches your inner thighs, groin, hips, and lower back. If you are prone to lower-back discomfort, take extra care to lean forward from your hips rather than rounding your lower back. This exercise may also cause some knee discomfort.
Hold the lifted straightness of the back leg and rotate your pubic bone toward the wall. If possible, hold that position and extend your arms upwards, lengthening upwards also through the side chest and the crown of your head.
Hold for five breaths and repeat for the other side.