The resistance band alternating torso twist is a great exercise to strengthen your core targeting the obliques. This exercise also helps improve range of motion in the hips and lower back area. Learn more about properly executing this exercise with the video above.
Regression
Make this move easier by performing reps at a slower tempo or moving closer to the anchor point to reduce the tension on the Slastix.
Progression
Make this move harder by moving farther away from the anchor point to put more tension on the Slastix.