The Bow

The bow is the 'granddaddy' of Alexander Lowen's bioenergetic exercises

Instructions: Stand with feet slightly wider than shoulder width apart, perhaps 18 inches. Keep the outside edges of the feet going straight out (which will point the toes inward somewhat). Make a loose fist with both hands and reach arms around to push into the small of the back. Bend both knees deeply but keep heels on the floor. Arch backward so that shoulders go back and pelvis goes forward. Keep weight on the balls of the feet. The idea and ideal behind this exercise is to assume a smooth curve or 'bow' Remember to breathe into the belly. As the body loosens up over time vibration will start to happen. Try to hold the position for at least a minute. Follow up with the forward bend.

Rationale: This is a 'stress' position. Part of the way it works is 1) it will not be comfortable at all until the muscles tighten and 2) as some of the unnecessarily engaged muscles fatigue, it is possible that a person will sink into the position better. The exercise also increases breathing, opens the chest. And it obviously challenges a tight pelvis, especially one which is 'cocked back' (Lowen's term, referencing the bottom of the pelvis) or said differently, tipped anteriorly (mainstream physical therapy, referencing the top of the pelvis)

Source:Alexander Lowen's Bioenergetic exercises