Minutes as a unit of time in training schedules

It would be useful if exercises in training schedules could be worked out not only in seconds, but also in minutes.

Functionalities:
✅ Set time per exercise in minutes and seconds (e.g. 1:30 min instead of just 90 sec).
✅ Clearer display for longer exercises or circuits.
✅ More flexible for exercises where seconds are less relevant, such as stretches or cardio.