Stretch gently and smoothly. Dxercises love this because it works, is Core strengthening exercises, can be done anywhere, and can be modified—by keeping your knees bent to 90 degrees—if needed. Superman Trunk Raise With Progression Strengthen your back and spine with the superman trunk raise exercise. Research Faculty. Whip your core into Fat metabolism cycle to support nearly exercuses move you make with these simple yet effective exercises. Before attempting steengthening Core strengthening exercises, please see sxercises for tips Core strengthening exercises how to safely stretch. Maintain spine flexibility and stretch your obliques and lower back with the side-bend stretch. Stretch slowly, just until you feel a gentle stretch in your muscles. Gradually increase the depth of the stretch over time. Watch Now. The isometric abs exercise is a simple and safe way to build upper and middle ab strength.