hey
hey, standing works but you'll eventually get to a point where ur loading ur back too much, maybe in a month of three years, if you want an alternative load up the leg press machine (or birth machine), the one where ur laying on ur back and pushing ur legs up, and do your toe presses on that, this will remove all the weight from ur shoulders and save ur back.
i found that the one at the gym where u sit down and load some weight onto the tops of ur knees hurt my nuts for some reason.