Wendler 5/3/1 Explained
Created by Jim Wendler, 5/3/1 is a strength program built on a simple philosophy, which is to start lighter than you think you should and progress slowly so you can keep progressing for a very long time. It is one of the most popular intermediate programs for good reason.
Start with your training max
Everything in 5/3/1 is calculated from a training max rather than your true one-rep max. Your training max is set at around ninety percent of your best single, and using this slightly conservative number is the whole trick, because it keeps the working weights manageable and leaves room to grind out extra reps. The four main lifts are the overhead press, deadlift, bench press, and squat, each trained once per week.
The four-week cycle
Each training cycle runs four weeks, and every week prescribes three working sets at rising percentages of your training max.
Week 2: 70% x3, 80% x3, 90% x3+
Week 3: 75% x5, 85% x3, 95% x1+
Week 4 (deload): 40% x5, 50% x5, 60% x5
The plus sign on the final set of each working week is the key, since that set is an AMRAP, meaning you do as many quality reps as possible rather than stopping at the prescribed number. Those extra reps are where rep records are set and where the program lets a good day pay off, while the deload in week four lets you recover before the next cycle.
How you progress
After each four-week cycle you raise your training max by a small fixed amount, typically about five pounds for the upper body lifts and ten pounds for the lower body lifts. Because the jumps are small and tied to the conservative training max, progress feels almost too easy at first, which is exactly the point, since slow and steady advances accumulate into large gains across many cycles.
Assistance work
The main lifts are the skeleton, and 5/3/1 is usually paired with an assistance template that fills in muscle and work capacity. Boring But Big, which adds five sets of ten on the main movement, is one of the best known, and there are many others depending on whether your goal leans toward size, conditioning, or pure strength.
Running 5/3/1 in Ægir Iron
5/3/1 runs on percentages, so the friction is usually doing the math for every set and tracking your training max as it climbs. In Ægir Iron you can prescribe each set as a percentage of your training max, let the app calculate the working weights and plate math, log your AMRAP reps, and watch your rep PRs update automatically. When a cycle ends, you bump the training max and the next four weeks recalculate themselves.