The strength training app that turns heavy sets into your next weight

To get stronger you need a plan built around a few big lifts, a weight for every set, and a rule for adding load that you can trust on heavy days. RIRLift does all three, free. Log the weight, the reps and how many you had left. The next set and the next session are worked out from what you just did.

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Coach answering "Build me a four-week plan from my recent progress" with the latest estimated 1RM and its trend chart

What a strength training app has to get right

A strength week on the Big 3 plan, set by set

Heavy day: the next set changes before you rest

Each day's main lift on the Big 3 plan below: squat on Day 1, bench on Day 2, deadlift on Day 3. All 3 to 5 reps, aiming for 4 with 2 left.

ExerciseYou loggedNext sessionWhy
Barbell Back Squat225 lb × 4, 3 left230 lb × 4One more rep left than planned. 225 × 36 ÷ 35 is about 231, rounded to 230.
Barbell Bench Press185 lb × 3, 1 left185 lb × 4One short of the target but still inside 3 to 5, so the weight holds. You don't get cut for a hard set.
Barbell Deadlift315 lb × 2, nothing left280 lb × 4Below the rep range with nothing left: 315 × 31 ÷ 35 is about 279, rounded to 280.

A bad set costs you one lighter set, not the session. The correction is marked as one, so the plan underneath stays intact.

Next week: what moves and what holds

Same plan, a week later. Your gym has 2.5 lb plates, so one barbell step is 5 lb.

ExerciseYou loggedNext sessionWhy
Barbell Back Squat230 lb, 5 / 5 / 5 / 5, 2 left235 lb × 3–5Every set hit the top of 3 to 5. One step up, and the rep target resets to 3.
Barbell Bench Press185 lb, 5 / 5 / 4 / 4, 2 left185 lb × 5The weakest set made this session's target of 4, so the next target is 5 at the same weight.
Barbell RowSet 1: 155 lb × 10, 4 left (target 10, 2 left)Set 2: 165 lbTwo more left than planned: 155 × 43 ÷ 41 ≈ 163, rounded to 165.

The squat moves, the bench builds a rep, the row jumps before set 2. Each lift goes at its own speed.

Week 7: the deadlift stalls

Three deadlift sessions in a row with no new rep. The bench is still climbing.

ExerciseYou loggedNext sessionWhy
Barbell Deadlift335 lb, 4 / 3 / 3, three sessions runningRecap suggests 300 lb × 3–5No new rep in three sessions. About 10% lighter, rounded to your plates. Choose Deload or Not yet.
Barbell Bench Press195 lb, 5 / 5 / 5 / 5, 2 left200 lb × 3–5A stall on one lift changes nothing on the others. Top of the range on every set: one step up.

Accept the deload and the target goes back to 3 reps at 300 lb, then builds again. Say Not yet and nothing changes.

Strength plans that open in RIRLift

Make it fit you

When a different app fits better

Questions

Is RIRLift a free strength training app?

Yes. Unlimited workouts, every suggested weight, in-session corrections, progression and stall suggestions are free with no account. Pro adds more Coach conversations, unlimited routines, Fine-tune and all-time analytics.

Do I need to know my one-rep max?

No. The app works from the sets you log. On a lift you've never done, it starts light, marks the weight Estimate, and one set of max reps gives it a real measurement.

Strength or muscle: which is this built for?

The engine is built around hypertrophy-style double progression, and it works the same way on heavy sets of 3 to 5. Most lifters chasing either goal train both. Hypertrophy vs strength training covers what actually differs.

How many days a week should I train for strength?

Three is enough to squat, bench and deadlift heavy once a week each and practice them again lighter. Four lets you split upper and lower and add volume.

What happens if I miss a session?

Nothing changes. The next session picks up at the weight you'd earned. After three weeks or more off, the app offers Ease back in: one week about 10% lighter.

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