Definitely "feel" it more standing and focusing on kicking into floor as hard as possible, but idk, they go through a good rom in the kneeling version, and since its easier you may actually be able to use more hf/low ab to dominate the movement. I still think standing roll outs using the wall as a spotter to turn you around as far out as you can go, while focusing on driving the feet into the floor is the king of core movements for athletes.