Jake had been doing nothing but pushing himself. All the work on his back hurt like fuck, but he gritted his teeth and got on with it. His chest ached, his arms more so, and he was pretty certain that his hands were going to be shaking for ages afterwards, but he didn't care. He'd seen how easily other Jake had been able to move around in his wheelchair, and he wanted that. He'd put up with all kinds of shit to get some more mobility and independence back.
He did what Aaron asked, ignoring the pain and the sound of their water bottles clattering against the wall again (he really needed to work on using the Force as well) and made himself get through the exercises. He could collapse in a heap later.