Good. I have some small bugs/suggestions:
The app icon can be changed on the iPhone. It changes on the home screen and in Health app. But it does not change in the iPhone Fitness app or on the Watch. I prefer bright green like the Workouts app. :/ The voice on the Watch is very loud despite volume being on the lowest setting. It also seems to ignore silent mode. My suggestion would be to signal end/start with vibration or maybe a short beep (not too loud). I live in a relatively silent area and I don’t want everyone around to know I do 10 push ups lol. When ending a workout early during rest time, it also lists the last block of rest when you open the workout from the calendar view. I suggest that the last rest is being deleted because it is only used to navigate to the menu to end the workout. Explanation: I have custom workout with 10 push ups and many reps with 10s breaks. I try to do as many 10s as I can, which varies.