The fastest way to build muscle is about working smarter not harder — it’s about how close you’re lifting to failure. That effort can be measured by Reps in Reserve (RIR) — the number of reps you could do before your form breaks down. You’ll know you’re close enough when: - That last rep slows down - The burn hits - You can see it on your face Aim to finish each set feeling like you maybe had one or two good reps left — no more. It takes some practice and a few form tweaks, but this small shift can double or even triple your ROI accelerating muscle growth. How close to failure have you actually been lifting lately?Drop your honest RIR estimate below ⬇️