(First post, oh yeah!)
In Foundation One, Rope Climb PE1 (Hinge Row) Coach says to start with your butt off the ground, but in the video it looks as though the model is planting it firmly on the mat and moving only his upper body.
What is the proper form? Do I need to keep my glutes in the air throughout the movement? If my feet slide should I brace them against something or find a natural spot where I'm pulling straight up?