Negative Pull Up: lats, biceps, forearms, mid to lower traps, chest, core, glutes
Single Arm Cuff: shoulders, scapular muscles, spinal erectors, core, glutes, lats, triceps, forearm extensors
Let Me In: lats, rear delts, biceps, forearms, core, hips, legs
Y-arm Crawl: deltoids, shoulder rotators, mid to lower traps