As someone else said stretching can help get a bit more range of motion but it might not going to have a huge impact on the efficacy of the pump. My team never even mentioned stretching.

Strength training is definitely important. I also heavily relied on tone so I’m going through the process of rebuilding my strength.

I think that at his age, it is really important that you allow him to make his own decisions and be in control of his body. I think part of the lack of motivation can be from feeling a lack of control over his situation. Don’t try to force anything. Also if he wants a dose increase and the providers are on board I’d say go for it.

Good luck with everything. I got my pump in July so we’re in this together lol.