The resistance band underhand row is a great exercise for upper body strength and stability. The main difference between the overhand grip and the underhand grip is that the overhand grip targets your upper back muscles while the resistance band underhand row targets the lower back, lats, and traps. So you should feel this movement throughout your traps, rhomboids and your rear deltoids. 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.
Progression
Make this exercise more challenging by moving further away from the anchor to increase the tension on the Slastix or by adding another resistance band.