TRN/LOG progression engine · Open calculators
The math behind
the bar.
Test the exact rules TRN/LOG runs in the gym: estimated maxes from reps in reserve, fewest-plate bar loading, comeback ramps after time off, and strength relative to bodyweight.
Reps left in
the tank.
A set of 8 with 2 reps left in the tank (2 RIR) is 10 reps to failure. TRN/LOG averages the Epley, Lombardi and Brzycki multipliers so the estimate holds across rep ranges and inverts cleanly when setting next week’s weight.
130.9 kg
From 100 kg × 8 at 2 RIR (10 reps to failure)
Weights you
can load.
A prescription of 83.7 kg is useless in a gym. TRN/LOG resolves every target to the closest load your bar and plates actually make, breaking ties downward so a 2-RIR set never turns into a grinder.
100 kg
20kg bar + 25/15 per side
Ease back in
after time off.
After 14+ days away from a lift, jumping straight back to your old top set is the rep you fail or the one that hurts. TRN/LOG tracks each lift’s clock independently and ramps you back to 100% over two to four sessions.
- Comeback session 180 kg 80%
- Comeback session 287.5 kg 87%
- Comeback session 392.5 kg 93%
- Session 4 · Full progression resumes100 kg 100%
Session 1 adds +1 RIR in reserve, and the first 2 sessions drop 1 working set per lift.
Strength vs.
bodyweight.
Scale weight jumps a kilo or two on water alone. In Progress → Body, TRN/LOG smooths weigh-ins into a 7-day trend, compares your estimated maxes against it, and tells you plainly whether your cut or bulk is on track.
1.64×
-0.5%
-0.4 kg per weekStrength held while you lost 1.4 kg. That's a cut going well.
Stop doing the
math by hand.
In TRN/LOG, every calculation on this page runs automatically from the sets and weigh-ins you log—even offline in a basement gym.
Start trainingSee the full TRN/LOG overview