+1 for this

When all sets are complete, make it more obvious. Currently it’s in small letters up top.

I had to keep an eye on the timer, which is actually very small. It would be great if it were larger. See JeFit for a good example of a well-visible rest-timer.

A timer like that is great as long as it can be minimized during the countdown or partially transparent so the info behind it can be seen during the countdown.