I remember you mentioning they 'are a staple' of your routine (but anybody who knows what they're doing chime in). I tried it out recently and loved it but the movement seems a little weird. Is my back supposed to arch at the top, then round when you're fully contracted? Hips are supposed to be stationary right? If someone has a video of the right form that would be awesome How much weight do you use? The pulleys at my gym go up to 190lbs, I did 190x10x3 today and don't know where to go from here.