Foleil gives your next strength target a link to recorded training. Repetitions, load, effort and available equipment inform the progression preview. The useful advantage is an explainable next step: you can see a proposed target in the context of what you logged, instead of treating a future number as an inevitable result.
How it works
Foleil compares confirmed working sets with the intended repetition ranges and load. A completed range can permit an available load step, while an eligible set below the range ceiling can gain a repetition. Very high recorded effort can lead to a lighter option; manual pins and safety limits remain part of the decision. The preview stays a proposal for you to inspect.
Why it matters
Progression is one of the subjects of the ACSM position stand (2009). Effort also deserves context: Robinson and colleagues' 2024 meta-regressions examine estimated repetitions in reserve and report uncertainty about the exact relationships. Neither paper validates Foleil's specific thresholds. They support discussing load, repetitions and effort as separate variables, rather than collapsing them into a promise that every workout should become harder.
Compared with other approaches
Hevy, reviewed 19 October 2026, documents previous workout values alongside set and load logging. That is a useful comparison baseline: recording history is established functionality elsewhere. Foleil's focus on this page is the connection from confirmed comparable results to a reviewable progression preview, inside its broader programme and week workflow. No head-to-head strength improvement or superior algorithm is inferred from those feature descriptions.
The evidence
A repetition at a different load is not automatically comparable evidence for the original target. Foleil also distinguishes preparation sets from working-set progression. If the required results or equipment information are missing, an increase is not manufactured to fill the gap. A pinned target remains protected. This gives the preview a narrower meaning than an AI coach predicting your capacity: it is a bounded choice drawn from the training evidence and settings available.
Put it into your day
Imagine a prescription with a repetition range across several sets. Log each set's real result, including effort when you choose to record it. At the next preview, inspect whether the proposed change is a repetition, a load step, a repeat or a lighter option. If you changed implements or used a different load, check that the comparison still makes sense. A difficult day can justify repeating work rather than chasing a larger number. The value lies in understanding the proposed next session and choosing it deliberately; it does not depend on claiming a particular rate of strength gain.
Frequently asked questions
Does Foleil increase every workout?
No. Missing comparable evidence, manual pins, equipment limits and recorded effort can retain or reduce a target.
Are warm-up sets used as working-set progression evidence?
Preparation sets are distinguished from the working sets used by the rep-range progression rule.
Is a target a prediction of my results?
No. It is a proposal for the next session. Your actual performance is recorded separately when you train.
What if I changed load during the last session?
Inspect the comparison before accepting a target. Results at a different load are not automatically equivalent evidence for the original repetition-range prescription.
