Add iOS live activities

[astashov]

Could show a running timer there, maybe a current exercise with completed/non-completed sets/reps/weights.

[StanleyMitchell8]

I would love this, I also feel like this would be a good addition while working on the watch integration. It would speed up the interaction on the phone. Another app i was using has both and they are very nice additions. Love your app btw and looking forward to your improvements.