Build Muscle
Upper / Lower Workhorse
4-day Upper/Lower hypertrophy split. Each muscle 2× / week, 12-16 sets at MAV. 8 weeks: 4 accumulation, 3 intensification, 1 deload. Intermediate (1-3 yr trained); commercial or home gym; 60-75 min sessions.
- Category
- Build Muscle
- Length
- 8 weeks
- Frequency
- 4 days/week
- Est. session
- 50–70 min
Last updated: June 2026
About this program
The most-recommended intermediate hypertrophy structure for a 4-day-per-week trainee. Each major muscle gets two productive sessions per week, split across complementary upper and lower templates designed around stretch-bias exercise selection and proven volume landmarks.
Designed for lifters with 1–3 years of consistent training, a home or commercial gym setup, and 60–75 minutes per session. Skip this if you've never run a structured program before — start with Foundations: Full-Body 3× — or if you're cutting on more than a 500 kcal deficit, where this volume becomes counterproductive per our Body Recomposition framework.
Volume targets follow our Volume Management framework: 12–16 working sets per major muscle per week sits in the MAV (Maximum Adaptive Volume) band for intermediates. The 2× / week frequency per muscle is backed by Schoenfeld et al. (2017), "Dose-response relationship between weekly resistance training volume and increases in muscle mass" — frequency-2 produces ~5% more growth than frequency-1 at matched volume. Exercise selection biases toward stretch-position picks (RDLs, incline curls, overhead triceps) per Pedrosa et al. (2023) on long-muscle-length training. The 4 → 4 → 3 → 1 phase pattern (accumulation × 4 + intensification × 3 + deload) follows the mesocycle structure in our Periodization framework.
Across 8 weeks you'll progress from RPE 7 working sets in week 1 to RPE 8–9 by the intensification block, then deload at 50–60% of accumulated volume in week 8. Most intermediates add 5–10 lb to their main lifts and 1–2 reps at fixed loads on isolations.
Build Muscle · 8 weeks · 4 days/week
Start to finish
- Frequency
- 4 days/week
- Per session
- 50–70 min
Who it's for
Four ways to tell at a glance whether this block belongs in your week.
- 01The goal
- 4-day Upper/Lower hypertrophy split.
- 02The commitment
- A steady four-plus days a week
- 03The arc
- 8 weeks, 3 phases that build and reset
- 04The coaching
- Your coach drives the plan forward — it reads each session and moves you up the moment the work gets easier, so you keep progressing
How it progresses
8 weeks across 3 phases — your coach watches the effort in your logged sets and moves the weight up the moment a load starts getting easier, so you keep climbing instead of waiting on the calendar.
- Weeks 1–462Intensity
Phase 1 · Accumulation
Accumulation
Build the work capacity foundation. Weekly volume ramps from 12 to 16 sets per major muscle as your body adapts to the 2-per-week frequency.
- Weeks 5–782Intensity
Phase 2 · Intensification
Intensification
Push closer to limit strength. Reps drop slightly, RPE rises, and the same volume produces a heavier weekly stimulus.
- Weeks 8–830Intensity
Phase 3 · Deload
Deload
A light week to absorb the gains. Half the working volume, same intensity floor. Don't skip it — this is where adaptation happens.
Sessions in this program
The individual workouts this program schedules through the week — open any session for its full exercise list, sets, and coaching notes.
Why your coach builds it this way
The most-recommended intermediate hypertrophy structure for a 4-day-per-week trainee. Each major muscle gets two productive sessions per week, split across complementary upper and lower templates designed around stretch-bias exercise selection and proven volume landmarks.
Designed for lifters with 1–3 years of consistent training, a home or commercial gym setup, and 60–75 minutes per session. Skip this if you've never run a structured program before — start with Foundations: Full-Body 3× — or if you're cutting on more than a 500 kcal deficit, where this volume becomes counterproductive per our Body Recomposition framework.
Volume targets follow our Volume Management framework: 12–16 working sets per major muscle per week sits in the MAV (Maximum Adaptive Volume) band for intermediates. The 2× / week frequency per muscle is backed by Schoenfeld et al. (2017), "Dose-response relationship between weekly resistance training volume and increases in muscle mass" — frequency-2 produces ~5% more growth than frequency-1 at matched volume. Exercise selection biases toward stretch-position picks (RDLs, incline curls, overhead triceps) per Pedrosa et al. (2023) on long-muscle-length training. The 4 → 4 → 3 → 1 phase pattern (accumulation × 4 + intensification × 3 + deload) follows the mesocycle structure in our Periodization framework.
Across 8 weeks you'll progress from RPE 7 working sets in week 1 to RPE 8–9 by the intensification block, then deload at 50–60% of accumulated volume in week 8. Most intermediates add 5–10 lb to their main lifts and 1–2 reps at fixed loads on isolations.
Common questions
The facts most people check before they commit a block to it.
01How long is the Upper / Lower Workhorse program?
Upper / Lower Workhorse runs 8 weeks at 4 days a week, structured into 3 phases so the load builds and resets on schedule. In Squatly, the coach tunes it to you, so the plan keeps moving with your training.
02Who is Upper / Lower Workhorse for?
4-day Upper/Lower hypertrophy split. It sits in the Build Muscle category, and the coach reads your training to tell you whether it's the right fit before you commit a block to it.
03How does Upper / Lower Workhorse progress over the weeks?
It opens with accumulation and finishes with deload. Each phase has a job — accumulate work, push intensity, or back off to absorb it — and the coach moves your load when your logged sets earn it, not on a fixed schedule.
04Does the coach adjust Upper / Lower Workhorse to me?
Yes. The program is the starting structure; the coach reads your e1RM trend, your weekly volume, and your effort on each lift, then tells you when to push — when a load is getting easier, it's time to add weight. It shows you the trend lines behind every call, and you accept, edit, or reject it. With every workout, the plan gets more yours.
Keep moving forward.
The program sets the structure. Your coach drives it forward — reading your numbers and pushing the weight up as you get stronger, so the plan stays yours and you keep progressing.
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Aleks · Coach
Proposal — add weight