The Apply All feature lets athletes apply the same results to multiple sets at once.
If your coach prescribes a specific weight or rep parameter and you had to modify or increase the load, then you can do this from your device and apply it to your entire workout across all sets.
For example, your workout has 3 sets of BB Back Squat prescribed at 185lbs for 8 reps. On this day the athlete was feeling sore and could only complete 6 reps at 180lbs. This athlete inputs the correct completed amount so that their coach can track their progress.