When to increase the weight you lift.

The one rule

There is one clear, evidence-backed signal that tells you it is time to add weight: you completed every planned set at the top of your rep range with at least 1 rep left in reserve (1 RIR) and technique intact. All four conditions matter. Miss any one of them and the weight stays where it is.

Why all four? Because adding weight prematurely — just because a couple of sets felt easy — leads to training above your capacity, breaking form, and eventually stalling faster than if you had been patient. The rule exists to protect long-term progress, not to slow you down.

Add reps first, then weight

Double progression is the method that turns this rule into a system. You pick a rep range — say 8–12 — and keep the weight fixed until you can do the top of the range (12) across all sets with 1+ RIR. Only then do you bump the load and cycle back to the bottom of the range (8).

Research comparing load progression with rep progression consistently shows that both drive similar hypertrophy as long as effort is kept close to failure. Double progression lets you squeeze out more quality volume at the same load before accepting the new challenge of a heavier weight.

How much weight to add

Smaller jumps mean you stay in your productive rep range longer and avoid the sharp form degradation that big jumps bring. The standard guidance from strength and conditioning practice:

These are not rigid rules — they are practical minimums. If your gym only has 5 kg jumps for barbells, that is what you work with. If you have micro-plates, use them: a 1.25 kg jump each side on the bench press over 12 sessions is 15 kg of progress in three months. That is significant.

Compounds vs isolations: different rules

The same principle applies everywhere, but the cadence differs:

• Compound lifts (squat, deadlift, bench, row, overhead press) involve more total muscle mass and neural drive. Progress tends to come faster early on, and can continue week to week for intermediate lifters. A 2.5 kg jump every one to two weeks is realistic at this stage.
• Isolation exercises (curl, triceps pushdown, lateral raise, leg extension) involve less total muscle, recover more quickly per session, but the load increments are smaller — because the absolute loads are smaller. You might add weight every two to four weeks on isolations even when progressing well.
• Lower body handles larger absolute loads and larger jumps — a 5 kg jump on the leg press is proportionally equivalent to a 2.5 kg jump on the bench for most people.
• Machines often have 5 kg or 10 lb plate increments that are too large. Use a plate clip or small weight to create intermediate steps rather than jumping a full stack increment.

A common mistake is comparing progression rates across exercise types. Not progressing week over week on a lateral raise is normal; not progressing week over week on a squat for a month is a signal worth investigating.

Autoregulation by RIR: the smarter way to decide

RIR (Reps In Reserve) is the number of clean reps you could still do at the end of a set. It is the practical core of RPE-based training (RPE = 10 − RIR). Using RIR to decide when to add weight is more accurate than following a fixed calendar because it accounts for how you actually feel that day.

The decision tree is simple: if you finish your final set with 0 RIR (you went to absolute failure), the weight is already challenging — do not add. If you finish with 1–2 RIR, you are in the productive zone; if you are also at the top of your rep range, add weight next time. If you finish with 3+ RIR, the weight may be too light or you had an unusually strong day — consider whether you need to push harder before adding.

You can explore the relationship between load, RIR, and your estimated 1RM using the RPE/RIR calculator or the 1RM calculator to put concrete numbers on your training.

When you are stuck: what to do

If you have been at the same weight for two or more sessions — you reach the bottom of your rep range but cannot get past it despite genuine effort — you are not failing to progress. You are flagging something that needs to change. Check in this order:

• 1Sleep and recovery. Strength performance is acutely sensitive to sleep quality. Less than ~6 hours the night before training measurably reduces force output. One or two poor nights can make a weight you normally manage feel impossible.
• 2Calorie and protein intake. In a moderate-to-aggressive calorie deficit, expect progression to slow. That is not failure — it is physiology. Increasing protein intake to ~1.6–2.2 g/kg bodyweight protects muscle in a cut and keeps strength moving.
• 3Accumulated fatigue. If you have trained hard for 4–8 weeks without a lighter week, accumulated fatigue masks your true fitness. A deload week — same exercises, roughly half the sets, more RIR — often breaks a stall without any other change.
• 4Technique drift. Record a set. Stalls often come from gradual range-of-motion reduction or setup changes that reduce the effective load on the target muscle. If you are cheating the reps to hit the number, your actual training load has not increased.
• 5Volume mismatch. Too little volume means insufficient stimulus; too much means you are not recovering between sessions. The evidence-supported range is roughly 10–20 working sets per muscle group per week, with the upper end reserved for advanced, well-recovered lifters.

Only after ruling out the above does it make sense to change the exercise, the rep range, or the programming approach itself. Most stalls have simple causes, not program problems.

What SammaGym does for you

SammaGym is a free workout tracker built around exactly this logic. After every session it shows your previous set inline — load, reps, RIR — so you always know what you did last time. Its auto-regulated progression engine applies the double progression principle: it suggests adding reps when you have room, and flags that you are ready to move up in weight when you have hit the top of your range with sufficient RIR.

• Previous set shown inline — same grey pattern used by Hevy: never lose track of your last session's numbers.
• Auto-progression suggestions — the app tells you when to add reps and when to add weight, based on actual logged RIR and rep data.
• PR and progress charts — see your load and volume trends over weeks and months, not just the last session.
• Offline-first — logs work without an internet connection; data syncs when you are back online.
• Rest timer from the lock screen — no need to unlock your phone between sets.
• Free forever, no subscription — no ads at launch.

It does not make the decision for you — you still log, you still feel the bar — but it eliminates the mental overhead of remembering last week's numbers and calculating whether you qualified for a jump.