Being able to exit the app and let the rest timer keep going and working in the background

Thanks for reporting that issue Sebastian. I can understand that's frustrating, and I'm guessing you're on iOS. What's going on here is if we let the timer run, iOS is killing the app in the background when you exit to save memory. We've already implemented a workaround with a notification. If you stay outside the app for the full timer duration (e.g. 25 sec), you'll get a notification telling you your rest is over. Let me know if that doesn't work at support@drmuscleapp.com. If you find other issues with the app, please drop us an email. We try to keep this site for feature requests. I'm marking this one as completed for now. Thx!