This classic pose has so many variations. You can do it actively and strengthen the backside of your body: triceps, all back muscles, buttocks, hamstrings, calves. You can also do it passively and restore your body and mind.
The framework of this pose is: shoulders rest on floor, blankets or bolster. Sternum is lifted. Abs are parallel to the floor which means it can be practiced during menstruation. Upper thighs rotate inwardly. The facial muscles and the tongue are relaxed.