Second Set Last Calculator - 5/3/1 SSL Program Generator

Run Second Set Last in the 531 Tracker app

The app generates the same SSL cycle, pre-fills every 5×5 weight, logs your sets with a rest timer, tracks your AMRAP PRs and bumps your training maxes when the cycle ends. Works offline, no account needed.

What is Second Set Last?

Second Set Last (SSL) is First Set Last with the weight turned up. After the day's three main working sets you do five sets of five at the weight of the second set - 75%, 80% or 85% of your training max depending on the week - instead of the first. Same structure, same 25 reps, roughly ten percentage points heavier.

That makes it a strength template. Sets of five at 75-85% are hard enough to drive the main lifts up on their own, and light enough that you can still do them well after the main work. It sits between FSL and Boring But Strong: heavier than FSL, half the volume of BBS.

It is run four days a week, one main lift per day. The calculator above builds the whole cycle - enter a recent hard set for each lift and every weight is worked out and rounded to what you can load.

FSL, SSL or BBS?

All three are supplemental sets of the main lift after the main work. They differ in weight and volume:

First Set Last - 5×5 at 65-75%. Moderate, sustainable, the default.
Second Set Last - 5×5 at 75-85%. Heavier, same volume. For lifters who have outgrown FSL and want intensity without more sets.
Boring But Strong - 10×5 at 65-75%. FSL weight, double the volume. For lifters who want practice and tonnage, and can recover from it.

If FSL 5×5 has become routine and you recover from it easily, SSL is the natural next step. If you would rather add sets than weight, BBS.

PR sets or 5s PRO?

SSL is heavy enough that this choice matters more than it does with FSL.

5s PRO - straight fives on the main sets, no AMRAP. The safer pairing, and the standard one when SSL is run as a two-cycle leader. The main work becomes a build-up to the 5×5 rather than a contest with it.
PR sets - an AMRAP on the last main set, then 5×5. Doable for a single cycle, particularly as an anchor, but be honest about week 3: an all-out set at 95% followed by five sets of five at 85% is a serious session. If the 5×5 starts to grind, that is the training max talking.

The calculator defaults to PR sets, because that is the standard 5/3/1 structure. Switch to 5s PRO if you are running two cycles back to back.

Training max

With SSL the week 3 supplemental sets are at 85% of your training max. At a training max of 85% of your real max, that is about 72% of your one-rep max for five sets of five - challenging but sensible. At a training max of 90% it is 77%, and by the fourth or fifth set most people are grinding. Set the training max at 85%. If you are coming to SSL from FSL and your training maxes have been creeping up for several cycles, this is a good moment to reset them.

Assistance and conditioning

The same as FSL: a push, a pull and a single-leg or core movement, 50-100 reps of each. The calculator gives you two movements a day at 5×10. Because the supplemental work is heavier than on FSL, keep the assistance to bodyweight and dumbbells and drop it to the low end of that range if recovery is a problem.

Conditioning: two or three easy sessions a week. Hard conditioning is fine on an SSL anchor cycle, less so if you are running it as a leader with 5s PRO.

Who SSL is for

Lifters with several cycles of 5/3/1 behind them who want to push strength without adding volume. Typically: FSL is easy, your AMRAP sets are comfortably beating their minimums, and you want the supplemental work to feel like it counts. SSL is also a good anchor after a BBB or BBS leader - the volume drops, the weight goes up, and the PR sets come back.

It is not a beginner template - run FSL or 5/3/1 for Beginners first - and it is not one to run for months on end with PR sets. One or two cycles, then a change.

Common mistakes

Jumping to SSL too early. If you have not run FSL for a few cycles, do that first. SSL is a progression, not a starting point.
Training max too high. The week 3 sets are at 85% of it. A 90% training max turns them into a grind.
PR sets for cycle after cycle. Fine for one cycle. For a longer block, use 5s PRO or drop back to FSL.
Adding volume. SSL is about weight, not sets. If you want more sets, run BBS instead.
Skipping the deload. After two cycles of 5×5 at up to 85%, take the light week.

Questions about Second Set Last

What percentage is Second Set Last?

The weight of the second main set that week: 75% of your training max in the 5s week, 80% in the 3s week and 85% in the 5/3/1 week, for five sets of five. With the 3/5/1 week order the first two weeks swap, so it is 80% then 75%.

What is the difference between FSL and SSL?

FSL uses the first set's weight for the 5×5 (65-75%); SSL uses the second set's (75-85%). Same number of sets and reps, about ten percentage points heavier. FSL is the default; SSL is where you go once FSL feels easy and you want more intensity without more volume.

Should I use PR sets or 5s PRO with SSL?

5s PRO if you are running two cycles as a leader; PR sets are fine for a single anchor cycle. SSL is heavy enough that an AMRAP at 95% followed by 5×5 at 85% in week 3 is a serious session - if the 5×5 grinds, lower the training max or switch to 5s PRO.

Is SSL 5×5 or 5×3?

5×5 is the standard and what the calculator generates. Some lifters run 3×5 or 5×3 at the second-set weight when using SSL as an anchor with PR sets, to keep the session manageable. If you do that, take the calculator's weights and simply do fewer sets.

How long should I run SSL?

One or two cycles, then a deload and something different - an FSL cycle, or a BBB or BBS leader. Unlike FSL, it is not a template to sit on for a year: the supplemental sets at 85% catch up with you.

What training max should I use for SSL?

85% of your estimated one-rep max. The week 3 supplemental sets are done at 85% of the training max, so a 90% training max pushes them to about 77% of your real max for five sets of five, which most lifters cannot sustain. If your training maxes have crept up over several FSL cycles, reset them before starting SSL.

Is SSL good for cutting?

Better than BBB or BBS, worse than FSL. The volume is moderate, but 5×5 at 85% in week 3 needs recovery. If you are dieting hard, run FSL; if the deficit is small, SSL with 5s PRO is workable.

Can I use SSL as an anchor after a BBB leader?

Yes, and it is a good choice. After two cycles of BBB with 5s PRO, an SSL anchor with PR sets drops the volume, raises the weight and brings back the AMRAP sets - exactly what an anchor is supposed to do. Run it for one cycle, then deload.

Does the calculator include the deload week?

Yes. The cycle is three working weeks, and a deload week at 40%, 50% and 60% for sets of five on the main lifts is shown separately, to run after every second cycle. Drop the 5×5 in the deload week.

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