Progressive overload, explained

What is progressive overload?

Progressive overload is the practice of making training gradually harder over time — more weight on the bar, more reps at the same weight, more sets, or the same work done with less rest — so the body keeps having a reason to adapt. Muscle and strength are responses to a demand slightly above what the body is used to. Repeat the same demand and the response stops, which is why a programme that never changes stops working after a few weeks.

The word gradually is the whole method. A step too large is a missed set or an injury; a step too small only costs time. Most of the craft is in choosing the step. The usual first step is the smallest one the equipment allows — 2.5 kg on a barbell, one rep in a set, one set in a session — because the body notices small steps and the joints forgive them.

How much should you add each week?

The reliable pattern is double progression: keep the weight fixed and add reps inside a range, and when every set reaches the top of the range, add the smallest weight step the equipment allows and start the reps again at the bottom. A set prescribed at 8–12 reps moves from 8 to 12 across several sessions before the bar gets heavier.

Liftor applies exactly that rule. It reads your last top set for the exercise, the rep range it was written for, and the reps you had in reserve, and it only suggests more weight when the top set finished with at least two reps in reserve. The increment depends on the equipment — a barbell moves in different steps from a dumbbell or a cable stack — and the suggestion comes with a reason and a confidence, so you can see why the number moved. When you have missed sets recently, it holds the weight rather than pushing it.

What do you do when progress stalls?

Change one variable, not all of them. If the reps have stopped climbing at a given weight, the usual causes are sleep, recovery between sessions, or accumulated fatigue across the block — none of which a heavier bar fixes. A short deload often restores the progression on its own; so does adding a set before adding weight.

Liftor watches the trend of your estimated one-rep max for each lift and treats a flat or falling trend as information rather than failure: it slows the suggested progression, and if the fatigue signals stack up it proposes a lighter week rather than another attempt at the same number.

Should you add weight or add reps?

Either, and the evidence says the difference is small. In 2022 Plotkin and colleagues took forty-three lifters with at least a year of training, split them into a group that added load each week at a fixed rep count and a group that added reps at a fixed load, and had both do four sets of four lower-body exercises twice a week for eight weeks. Muscle growth in the quadriceps modestly favoured the reps group; the squat one-rep max slightly favoured the load group; the authors called the differences of questionable practical significance and both progressions viable.

Double progression uses both in turn — reps first, then load — which is why Liftor runs it. Reps are the finer instrument: one rep is a smaller step than 2.5 kg on a bar, and it costs the joints less. The load step comes when the whole range has been earned, and it comes in the smallest increment the equipment allows, because a dumbbell rack and a cable stack do not move in the same steps as a barbell.

How many sets a week is enough?

More than most beginners do and fewer than most intermediates think. Schoenfeld, Ogborn and Krieger pooled thirty-four training groups from fifteen studies in 2017 and found a graded dose–response between weekly sets and muscle growth: each additional weekly set for a muscle was worth about 0.37 percentage points of extra growth over a study, and the higher-volume arm of each study out-grew the lower by about 3.9 points. Ten or more sets a week per muscle was the band where the response was clearest, with a trend past it rather than a wall.

Volume is the variable that adds up quietly. Liftor writes it into the block and then moves it by a set or two from the morning rather than by the week: a good readiness score keeps the sets, a poor one drops one, and four or more sessions in seven days at or above the planned volume is one of the four signals that starts the conversation about a deload.

What does progressive overload look like week by week?

Take a set prescribed at 8–12 reps, three sets, 60 kg, with the rule that the bar rises only when every set reaches twelve with two reps still in reserve. The sessions look like this:

Week three is the one people skip. The top set reached twelve with only one in reserve and the other two fell short, so the rule holds the weight and asks for the reps again with something left. Four weeks for 2.5 kg looks slow; if it held for a year, twelve of those cycles would be 30 kg. It rarely holds in a straight line, which is what a deload and the next block are for.

Sources

• Plotkin D, Coleman M, Van Every D, et al. Progressive overload without progressing load? The effects of load or repetition progression on muscular adaptations. PeerJ, 2022; 10: e14142
• Schoenfeld BJ, Ogborn D, Krieger JW. Dose-response relationship between weekly resistance training volume and increases in muscle mass: a systematic review and meta-analysis. Journal of Sports Sciences, 2017; 35(11): 1073–1082
• Liftor’s progression engine: the double-progression rule, the two-reps-in-reserve gate and the per-equipment increments (utils/progressiveOverload.ts in the app’s source)
• Apple’s record of the app: Liftor - Workout & Meal Plans, App Store