The Valslide Bodysaw: it's a deceptively subtle movement, and you get a whole lot of action! It's like a traveling plank... a "magic carpet ride," if you will. (Sweet song, btw.) Start with just a few reps to "figure it out" (3-5 at a time with as little rest as you need to keep solid form) - then as you get better, step it up and try sets of 8-10. As with any #Valslide exercise, focus on the quality of movement... and not some arbitrary amount of reps.