Supported formats:
3 Push-ups 30 / 10 - 3 reps, 30s work, 10s rest
5 Squats / 15 - 5 reps, manual timing, 15s rest
2 Workout [3 Pushups 30/10, 2 Squats 40/15] - Nested: 2 rounds of workout
1 Circuit [30/, 3 Pushups 20/10, /15] - Mixed: intervals + nested exercises