When I go to log exercises, I haven't found a way to log time or distance instead of reps for exercises. It would be great if you could assign/log time (i.e. seconds for a plank) or distance (even just down and back) instead of only being able to log reps! If this is already an option, I just haven't found it outside of adding a modifier for the seconds, but then you still have to log reps during the workout.