Evidence-Based 4-Day Hypertrophy (PPLA)

This program is engineered for one objective: skeletal muscle hypertrophy — an increase in muscle fiber cross-sectional area via mechanical tension, adequate weekly volume, and proximity to muscular failure. It is not a strength, powerbuilding, or fat-loss template. Structure. Four days per week organized as Push, Pull, Legs, and Accessory. Every major muscle receives two weekly exposures — the frequency most consistently supported by the hypertrophy literature — with additional Day 4 volume allocated to the musculature with the greatest influence on upper-body visual proportion: lateral deltoid, clavicular pectoralis, latissimus dorsi, biceps, and triceps. Sessions may be performed on any four days that accommodate the trainee's schedule. Volume. Weekly working-set volume targets 10–20 hard sets per muscle group, scaled to trainee tolerance. Intensity (RPE). RPE 8 = 2 reps in reserve; RPE 9 = 1 RIR; RPE 10 = momentary muscular failure. Compound movements are generally capped at RPE 9 to manage joint and systemic fatigue; isolation movements and final sets of compounds, where failure is safe, are taken to RPE 9–10. Where two RPE values are dashed in the prescription (e.g. "8–9"), early sets are performed at the lower bound and the final set at the upper bound, producing a brief intra-exercise effort ramp. Rep ranges. Current evidence demonstrates statistically equivalent hypertrophy across rep ranges from approximately 5 to 30 when effort is equated. Ranges are therefore assigned by mechanical fit: compounds in the 6–12 range (optimal tension-to-fatigue ratio) and isolations in the 10–20 range (where stability ceases to be the limiting factor at near-failure loads). Progressive overload. Double progression. At the current load, add repetitions within the prescribed range session over session; once the top of the range is cleared on all working sets at the target RPE, increase load by the smallest available increment and re-enter the range from the bottom. Tempo, range of motion, and execution standard are held constant so that load progression reflects genuine contractile improvement. Execution. Eccentric phases are controlled across 2–3 seconds; concentric phases are executed with intent but without ballistic acceleration. Full range of motion on every repetition. Rest 2–3 minutes between compound sets and 60–90 seconds between isolation sets. All working sets are logged to enable week-over-week comparison and targeted overload. Exercise selection. Every primary movement is a standard commercial-gym staple. Each prescribed alternate reproduces the primary exercise's stimulus on equipment universally available, using identical sets, rep range, and RPE targets. Alternates resolve equipment contention, not secondary training effects. Scope. The program prescribes resistance training only. Nutrition, sleep, cardio, and mesocycle-level periodization (deload timing, block-to-block volume progression) remain the trainee's responsibility.