Reading the four numbers
- 3-1-1-0
- Eccentric (lowering) · pause at the bottom · concentric (lifting) · pause at the top — each number is seconds. This example, this programme’s Week 1 back squat, is 3s down, 1s paused in the hole, 1s up, no pause at the top.
- 3-3-X-0
- "X" in place of a number means move that phase explosively — as fast as you genuinely can, not on a count. This example, Week 6’s back squat, is 3s down, 3s paused at the bottom, drive up as hard and fast as possible, no pause at the top.
Why this programme prescribes it
It standardises the stimulus. A rep's difficulty depends on how fast it's performed, not only the weight and rep count — the same weight moved faster is an easier rep. Writing the tempo down is what makes “RPE 7” mean the same thing this week and next; without it, RPE stops being comparable week to week.
This is a measurement/programming argument, not a muscle-growth claim on its own.
It removes momentum. A controlled lowering phase and a real pause at the bottom take away the free elastic rebound a rushed rep gets from the muscle and tendon stretching and snapping back (the "stretch-shortening cycle"). Without that assist, the muscle has to start the lift from a dead stop — why a paused rep feels harder at the same weight, and why it’s obvious immediately if a rep gets bounced instead of controlled.
Evidence: solid, well-established muscle physiology (Komi PV, "Stretch-shortening cycle: a powerful model to study normal and fatigued muscle." J Biomech 33(10):1197–1206, 2000) — a mechanical fact, not a hypertrophy-specific finding.
Tendon and connective tissue load differently under a controlled tempo. Tendons adapt to how they're mechanically loaded, and a slower, controlled rep holds real tension in the tissue for longer per rep than a bounced one — relevant here because this programme leans corrective (the shoulder/hip work).
Evidence: real but broader than this exact prescription. Bohm S, Mersmann F, Arampatzis A, "Human tendon adaptation in response to mechanical loading: a systematic review and meta-analysis of exercise intervention studies on healthy adults." Sports Med Open 1:7, 2015 (27 studies, 264 participants) found loading INTENSITY was the strongest driver of tendon stiffness gains, with duration a smaller factor — applying that general principle to this programme's tempo choice is this programme's own reasoning, not a trial that tested this exact tempo.
What it does NOT do: make a set better for muscle growth by itself. A slower or paused tempo is not shown to build more muscle than a rep performed under your own, honestly controlled pace.
Evidence: the best current evidence points the other way. Schoenfeld BJ, Ogborn DI, Krieger JW, "Effect of repetition duration during resistance training on muscle hypertrophy: a systematic review and meta-analysis." Sports Medicine 45(4):577–585, 2015 found similar hypertrophy across repetition durations from 0.5 to 8 seconds each — and very slow reps (over roughly 10s) came out WORSE, not better.