Reps in Reserve
A simple way to judge how hard to push a set: 'reps in reserve' (RIR) is how many more reps you could have done before failure. Stopping a set at 2 RIR means you had about 2 reps left in the tank.
Coaching onlyA phone camera can't grade this one reliably, so TrueForm teaches it step by step instead of pretending to score it.