The Natural Movement Kit resistance band jabs are great for postural and core stability. They are also good for core and arm strength. Learn more about properly executing this exercise with the video above.
Regression
Make this exercise easier by moving closer to the anchor to reduce the amount of tension on the Slastix or using something to help stabilize yourself.
Progression
Make this exercise more challenging by moving further away from the anchor or adding another band to increase the tension on the Slastix.