Bench press progression: how to log it, ramp it and add weight

Most bench press stalls are arithmetic before they are weakness. The smallest plate pair in the gym adds 2.5 kg whether the bar holds 80 kg or 120 kg, and on the smaller lift that step buys effort rather than progress. Computed with the app's model, 80 kg for five at RPE 8 is worth 98.6 kg for one, and 82.5 kg for five at RPE 9 is worth 98.6 kg as well. The jump cost a whole point of RPE and moved the estimate nowhere. On a 120 kg squat the same 2.5 kg costs about half a point. Every number below comes from compute.mjs, the code behind the one-rep max calculator, or carries a citation.

What the bench press trains

In the app's exercise library the barbell bench press is a compound horizontal push: chest is the primary muscle, triceps and front delts are secondary, and working sets count toward the weekly set target for chest on the 14-muscle grid.

The chest responds first. Seven untrained men who benched three days a week for 24 weeks, three sets of ten at 75 per cent of their max, had thicker pecs after the first week and thicker triceps only after week five, while their biceps did not change [1].

Grip width changes the load more than the muscles. In twelve national and international bench press competitors the 6RM was 5.8 to 11.1 per cent heavier with a medium or wide grip than with a narrow one, and activation was similar across grips apart from 25.9 to 30.5 per cent less biceps activity on the narrow grip [2]. An incline cut the 6RM by 18.5 to 21.5 per cent and triceps activation by 58.5 to 62.6 per cent [2]. Pick one grip and one angle for a block. The estimate you build belongs to that setup.

How to log a bench press

A bench press is a load lift: you log the weight on the bar, not the bar plus your bodyweight, and it is not per-side, so one set is one line. Give each set a role. Sets before the working weight are warm-ups or ramp-ups and never count toward volume, the heaviest set of the day is the top set, and anything after it at a lower load is a back-off. Only normal, top and back-off sets count toward the chest total.

Log RPE on the top set at least. The scale is reps in reserve: RPE 10 means none left, 9 means one, 8 means two, and bar speed falls as the rating rises, with a correlation of minus 0.88 in experienced lifters [3]. A set logged without RPE is treated as RPE 10, the assumption every classic formula makes.

Rate the bench by reps left, because bar speed misleads on this lift. Fifteen powerlifters working up to a true max rated the bench 9.7 out of 10 on average, and the bar on that last rep moved at 0.10 metres a second, less than half the 0.23 of their squat max [4]. A grinding bench rep is what a bench max looks like.

The warm-up ramp for an 80 kg working set

The app builds the ramp from the planned weight of the first working set. For 80 kg, compute.mjs warmup --kg 80 returns three sets.

The working set is a 25 and a 5 on each side, from the plate calculator the app opens on any barbell set. Each ramp load rounds to the nearest 2.5 kg, and anything above 95 per cent of the working weight is dropped. The 85 per cent set appears once the working weight passes 80 kg, so the week the bar goes to 82.5 kg the ramp grows to four: 20 kg, 42.5 kg, 57.5 kg and 70 kg for two. The ramp grooves the bar path. It is not where the reps go.

What 80 kg for five at RPE 8 is worth

Five at RPE 8 is two reps in reserve, so 80 kg was a 7-rep load that day. The model reads the reps-by-RPE chart along its diagonal, reps plus reps in reserve, and lands on 81.1 per cent of 1RM: an estimated max of 98.6 kg. Epley says 93.3 kg and Brzycki 90 kg, because both assume the fifth rep was the last one available, and logging the set without RPE puts the app beside them at 92.7 kg. The rep-max ladder from that 98.6 kg, via compute.mjs ladder --kg 80 --reps 5 --rpe 8, is the heaviest load for each rep count at RPE 10.

The rungs sit close together: from six reps to seven the load drops 2.5 kg, exactly one plate pair. That spacing is the whole story of bench progression at this weight. The app's rep-max table shows the 1, 3, 5, 8 and 10 rep rungs next to your logged bests at each. The guide on how the estimated 1RM is built covers the chart and the Epley tail above 12 reps.

Why a 2.5 kg jump costs the bench a full point of RPE

Take the same lifter forward a week at a time, adding the plate pair whether or not they earned it. The three rows below are one estimated 1RM.

Two jumps, no strength gained, and the lifter is benching a 5-rep max every week. Week four fails and the lifter blames the program. The program was fine. The step was too coarse for the lift.

On the squat the same arithmetic is gentler. 120 kg for five at RPE 8 is worth 148 kg and 122.5 kg for five at RPE 8.5 is worth 148.7 kg, so one jump costs about half a point and the squat earns two jumps for every one the bench earns. The back squat guide runs the same numbers for 120 kg.

The alternative is a rep. At 80 kg, six at RPE 8 is worth 101.8 kg, and 82.5 kg for five at RPE 8 is worth 101.7 kg, so on this bench a rep and a plate pair are worth the same, and the rep can be earned without touching the bar. Over eight weeks in 43 trained lifters, adding reps at a fixed load and adding load at fixed reps grew the quads about equally, with strength favouring the load group by 2.0 kg, a difference the authors called of questionable practical significance [5].

Which progression scheme suits the bench?

The app has seven schemes: Auto, Double, Top set + back-off, Load, Reps, RIR and Manual. For a 5 to 8 rep bench, two fit.

Double suits straight sets at one load. The load holds until every working set reaches eight, then rises by 2.5 kg and the reps reset to five. The scheme reads every set rather than the best one, so 8, 7 and 6 keeps you at 80 kg for another week. The double progression guide covers the range, the ceiling and the bad days in detail.

Top set + back-off suits one heavy set with lighter volume behind it at a fixed percentage. With a target of RPE 8 and an 80 kg top set, the next top set computed by the app's model is 82.5 kg after a set rated RPE 7 or 8, 85 kg after RPE 6, and a hold at 80 kg after RPE 9. A top set at RPE 9.5 or 10 is a grinder, so the scheme holds and warns rather than recomputing the back-offs off a bad day.

Across every scheme, a planned deload week never emits an increase, a load increase never leaks through on a cut, and three sessions without progress flags a stall by default. More than 30 days off the bench resets it: the same 80 kg top set after a 35-day layoff comes back as a 75 kg suggestion.

Mistakes lifters make with bench progression

Logging without RPE is the most expensive. The same 80 kg for five with no rating is treated as a max and comes out at 92.7 kg instead of 98.6 kg, so every suggestion downstream starts from the wrong number.

Adding the plate on a schedule is the second. The table above shows where that ends: RPE 10 in three weeks with no change in the estimate.

Changing grip mid-block is the third. A wide-grip 6RM runs 5.8 to 11.1 per cent heavier than a narrow-grip 6RM in the same lifters [2], so a narrower grip looks like a lost week and a wider one looks like a PR. If the grip changes, start a new history.

Substitutions and what changes when you swap

A close-grip bench keeps the pattern with a 6RM 5.8 to 11.1 per cent lighter than the wide grip, and in the same lifters triceps activation did not differ between grips, only biceps activity fell [2]. An incline press costs 18.5 to 21.5 per cent of the 6RM and more than half the triceps activation [2]. A dumbbell bench press steps by 2 kg in the app rather than 2.5 kg, and a machine chest press by 1 kg. Whatever you swap in, the estimate and the ladder belong to the lift they came from. A 98.6 kg flat bench says nothing about an incline, and the new lift starts its own history.

Questions

How much weight should I add to the bench press each week?

The app's step for a barbell lift is 2.5 kg, added only when the trigger is met: every set at the top of the range on Double, or a top set at or under its RPE target on Top set + back-off. On an 80 kg bench that step is worth a full point of RPE, so a week without the jump is a hold, not a failure.

Why does my bench press stall before my squat?

Because the plate is the same size and the lift is smaller. Computed with the app's model, 2.5 kg on an 80 kg bench costs a full point of RPE: 80 kg for five at RPE 8 and 82.5 kg for five at RPE 9 share one estimate. On a 120 kg squat the same jump costs about half a point.

Should I use 0.5 kg microplates on the bench press?

They make the step match the lift. With 0.5 kg plates, 81 kg loads as a 25, a 5 and a 0.5 on each side, and 81 kg for five at RPE 8 is worth 99.9 kg against 98.6 kg at 80 kg. In the app you can set a smaller load step for a lift in the program editor, and the scheme then suggests 1 kg jumps.