When a set turns genuinely hard, the last few repetitions feel decisive, as though everything before them was rehearsal for the moment the bar slows. For decades, lifters treated training to failure as the toll you paid for growth, the proof that a set had been worth doing. The evidence now tells a more measured story, and it changes how the final reps of every set should be judged. Proximity to failure, usually expressed as repetitions in reserve (RIR), describes how many m

Every serious lifter autoregulates. The question is with what signal. Most rely on RPE or reps-in-reserve, which is useful but subjective, or on a flat percentage of one-rep max that ignores how the body actually feels on the day. There's a third option, and the evidence over the last decade has quietly made it the most defensible: end the set when the bar slows down by a defined amount. This isn't a new idea, but the trials behind it are now mature. We have RCTs, meta-anal