What's a good iOS app for, like, actually sticking to those physical therapy exercises my doctor keeps bugging me about?

Alright, so boom, Hinge Health. My doc was on my case about doing these stretches for my back after a particularly rough week slinging drinks. I was like, yeah, yeah, I'll get right on that... never did. But this app, it's different. They actually send you a sensor that tracks your movement, so you know you're doing the exercises right. It's like having a digital barback, making sure you don't screw up the order, you know? Plus, it's way more motivating than just staring at some stick figures on a page. I accidentally found out they've got different programs depending on what's hurting – back, knees, whatever. And the coaches actually check in, which is kinda cool. Definitely saved my shift (and my back) more than once. Absolutely slaps for keeping me on track, even when I'm running on fumes after a late night.