While a client is "doing" a workout within the app - it would be great if there was an option to add a note while still IN the workout. The feature would be available in close proximity (maybe a plus sign that expended to a text box) to where the client would post their reps or weights.
Condition = client was assigned to perform strict pull-ups. Half-way through the exercise, the client had to modify with a band.
The ability to add a note when reporting would allow the client to say they did "X strict repetitions" and "Y modified repetitions"