PHAT Workout Program: Layne Norton’s 5-Day Powerbuilding Split

Use Layne Norton’s Biolayne article for the original PHAT routine and instructions.

Biolayne offers the PHAT PDF by email after newsletter signup.

Boostcamp is a convenient app implementation, but at least one current review reports differences in exercise order and speed-day details. Compare the app with the creator article before treating every detail as original PHAT.

The creator-published sequence is:

1. Upper Body Power
2. Lower Body Power
3. Rest
4. Back and Shoulders Hypertrophy
5. Lower Body Hypertrophy
6. Chest and Arms Hypertrophy
7. Rest

Each muscle group receives a heavy exposure and a higher-volume exposure across the week. That twice-weekly frequency is useful because it distributes work, not because frequency itself is magic when weekly volume is equal.

Choose one primary power movement per relevant category. Do not stack squats and front squats as separate lower-body power lifts in the same session.

The primary power work sits in the 3–5 rep range for 3–5 working sets. Rest long enough to recover; the creator explicitly allows five to six minutes when needed. Assistance work follows in moderate rep ranges.

Power days still include assistance, so choose loads that leave capacity for the remaining session and week.

The three hypertrophy days begin with speed work for the corresponding power movement, then move into bodybuilding-style work. The creator article uses exercise-dependent ranges from roughly 8 to 20 reps with one- to two-minute rest periods for most hypertrophy work.

The example routine is intentionally large. It is not a rule that every new PHAT user must complete every auxiliary movement from week one. Layne Norton notes that someone not adapted to the frequency and volume may need to remove an assistance or auxiliary exercise while adapting.

The original article does not give one universal weekly load formula for every movement. Progression depends on the role of the exercise.

Power movements

Stay inside the 3–5-rep target with clean heavy work. Add load when you can complete the intended sets and reps without turning every final rep into a miss. The creator also suggests rotating power movements every two to three weeks as one way to make consistent progress.

Hypertrophy movements

Use stable exercises long enough to add reps or load inside the prescribed range. A simple double-progression approach—reach the top of the range across your sets, then add the smallest practical load—is easier to audit than inventing percentage jumps for every isolation exercise.

Speed work

Progress only while the bar remains explosive. More load with slower reps defeats the purpose.

Layne Norton’s guidance is more conservative than many PHAT spreadsheets imply. During the first two to four weeks, he recommends not training to failure while adapting to the volume and frequency.

After adaptation, absolute failure is reserved for the last one or two sets of an exercise. Earlier sets stop roughly one to two reps short. That keeps more power and volume available across the full session and week.

Broader research also does not show a clear requirement to train every set to momentary failure for strength or hypertrophy. The practical point is simple: PHAT already has enough work without turning every set into a test.

The creator article expects an adaptation period and explicitly allows removing assistance or auxiliary work at the start. Use that permission. Keep the power movements, preserve the day’s role, and trim lower-priority work before cutting sleep or rushing heavy sets.

Layne Norton recommends deloading roughly every six to twelve weeks. His example is one to three weeks using about 60–70% of normal working weights.

A four-week app block is not the original framework’s deload schedule.

Deload sooner when performance, motivation, joint tolerance, and recovery are trending down together. Do not wait for a calendar date while every session deteriorates.

Substitute exercises by role:

• power press for another stable heavy press;
• power pull/row for another loadable pull;
• lower-body power movement for a technically familiar squat or pull pattern;
• hypertrophy movements for exercises that train the same target through a tolerable range of motion;
• speed work only when the replacement can still be moved explosively and safely.

Do not change every exercise at once. Stable selections make progression and recovery easier to interpret.

PHAT uses two power days and three body-part-oriented hypertrophy days. PHUL generally uses a four-day upper/lower structure with power and hypertrophy sessions.

PHUL is the easier fit when five days or the larger exercise menu are the problem. PHAT gives you more bodybuilding specialization plus dedicated speed work, but asks for more time and recovery.

PHUL details vary by source, so compare a documented template rather than treating every upper/lower power-hypertrophy routine as the same program.

nSuns is strength-first: frequent percentage work on the main lifts, weekly AMRAP progression, and user-selected accessories. PHAT distributes the week into power, speed, and bodybuilding roles.

Choose nSuns when the big lifts and weekly training-max progression are the main goal. Choose PHAT when you want more dedicated hypertrophy exercise variety and can commit to five training days.

Kizen is the cleaner fit when you want a defined powerbuilding block with fewer decisions. Choose PHAT when you can manage an ongoing framework and a larger weekly workload.

The RP-style hypertrophy framework is more explicitly built around muscle-specific volume, RIR, and recovery feedback. PHAT keeps strength/power work central and uses a stable five-day identity.

Choose PHAT when heavy power work is part of the goal. Choose the RP approach when hypertrophy is the clear priority and you want volume adjusted by muscle group rather than by a fixed weekly split.

PHAT is still a useful powerbuilding framework because its week has clear jobs: lift heavy, practice speed, then accumulate hypertrophy work. The original Biolayne article is detailed enough that you do not need a mystery spreadsheet to understand it.

Its main weakness is not the idea—it is the amount of work people try to force into every session. Start with fewer assistance and auxiliary exercises, avoid failure while adapting, and keep the power days genuinely powerful by resting long enough.

Use the creator article as the source of truth and the FitFrek workbook only as a blank log. If five days or the exercise count repeatedly conflicts with recovery, move to Kizen, 5/3/1 BBB, or the RP-style framework.