The Arnold Split
A 6-day, high-volume split that pairs opposing muscle groups and pyramids the weight up every lift. Here's the schedule, how the pyramid actually loads, who should run it — and how to run it on your iPhone without a clipboard.
The Arnold Split is one of the most recognizable names in bodybuilding programming, and the routine behind the name is specific: six training days, opposing muscle groups paired into single sessions, and a lot of volume per body part. Chest pairs with back. Shoulders pair with arms. Legs stand alone. Each pairing comes around twice a week, and the sets pyramid up in weight inside every exercise.
This guide is built for actually running it, not admiring it. I'll lay out the exact 6-day schedule, explain the agonist-antagonist pairing and why it works, walk the pyramid progression set by set, and be honest about who has the recovery to use this much volume. Then I'll show you how LiftRing runs the whole thing on your phone — pre-filling the weight for every set in the pyramid and telling you why it moved.
Start free — 3 workouts unlocked →What is the Arnold Split?
The Arnold Split is a 6-day, high-volume routine that pairs agonist and antagonist muscle groups — muscles that pull in opposite directions — into the same session. It's a generic name for a training methodology, the way "push pull legs" is, not a single authored document with fixed sets, reps, and a progression rule that ships with the name. What's consistent across every version is the structure:
- Chest + Back — a pressing muscle paired with a pulling muscle. While your chest works, your back recovers, and vice versa.
- Shoulders + Arms — delts paired with biceps and triceps, the smaller muscles that already assist the big presses and rows.
- Legs — quads, hamstrings, glutes, and calves get their own day, because they need it.
The reputation is high volume for a reason: stacking two opposing groups into one session, then training each pairing twice a week, piles up a lot of sets per muscle. That's the appeal — and the demand.
Why pair opposing muscles (agonist-antagonist)?
Pairing chest with back, or biceps with triceps, isn't arbitrary. When you press, your back rests; when you row, your chest rests. So you can superset or alternate opposing lifts without one stealing recovery from the other — you keep the session moving and density high without grinding the same muscle into the floor.
There's also a balance argument. Training a press and its opposing pull in the same session keeps your pushing and pulling volume roughly even, which is exactly what tends to drift out of balance on splits that skew toward "mirror muscles." The Arnold Split bakes the antagonist work into the same day, so it's harder to skip.
The exact 6-day schedule
The week runs the three pairings twice, with a single rest day. Most people anchor the rest day on Sunday.
Day 1 & Day 4 — Chest + Back
Pressing and pulling in one session: incline and flat presses, dips and flyes for chest; rows, pulldowns or pull-ups, and pullovers for back. Alternate a push lift with a pull lift to keep density high while each muscle recovers.
Day 2 & Day 5 — Shoulders + Arms
Delts first — overhead press, lateral raises, rear-delt work — then biceps and triceps: curls, extensions, close-grip work. The arms are already warm from shoulder pressing, so they take less to fatigue here.
Day 3 & Day 6 — Legs
Squats, leg press, hamstring curls, leg extensions, and calves. Legs get their own day twice a week because the volume and the recovery cost are both high — there's no opposing pairing that makes sense to bolt on.
Day 7 — Rest
One full rest day. On a six-day, high-volume split, this day isn't optional padding — it's where the adaptation you trained for actually happens.
Inside each session, the structure usually looks like this:
- 2–3 exercises per muscle group, so a paired day runs 4–6 exercises total.
- 3–4 sets per exercise, pyramiding up in weight (see below).
- That lands a paired session around 16–24 working sets — high by design.
How progression works: the pyramid
This is where the Arnold Split parts ways with the splits people usually compare it to. Push Pull Legs and Upper/Lower are typically run with double progression — fixed weight, add reps, then bump the load. The classic Arnold Split runs a pyramid instead: the weight ramps up across the sets of a single exercise.
- Top set — start lighter and higher-rep to groove the movement and pre-fatigue the muscle. Think 12–15 reps at a weight you could do more of.
- Working sets — add weight and drop reps into the hypertrophy range, around 8–10. These are the sets that drive the adaptation.
- Burnout set — often the heaviest grind for low reps, or a back-off to lighter weight for a high-rep finisher, depending on the lift.
Week to week, you progress by adding load to the working sets once your reps there are solid. The pyramid shape stays the same; the numbers underneath it climb.
| Set | Role | Reps | Load |
|---|---|---|---|
| 1 | Top set (warm pattern) | ~12–15 | Lighter |
| 2 | Working set | ~8–10 | Heavier |
| 3 | Working set | ~8–10 | Heaviest |
| 4 | Burnout / back-off | ~6 or ~15 | Heavy grind or light finisher |
The honest caveat. Because the Arnold Split is a generic methodology, not an authored document, anyone selling you "the correct Arnold Split sets and reps" is really handing you their version. Treat the pyramid above as a sensible default, not gospel. The pairing structure and the pyramid shape are the framework; the exact numbers are your call.
Who the Arnold Split is for
The Arnold Split is an advanced, high-volume split. It earns its place when you already have a solid strength base, the work capacity to handle a lot of sets, and — this is the real gate — the recovery to back six training days a week. That means consistent sleep, enough food, and a schedule that lets you actually show up six times.
It's a poor first program. A beginner gets stronger faster on a simple 3-day full-body plan — a progression-driven split or a StrongLifts-style 5×5 — because each lift comes around often while linear progression is still adding weight every session. The usual path: build the base on full body, move to a 4-day split like PHUL or Upper/Lower, then graduate to the Arnold Split once the volume is something you can recover from rather than just survive.
Recovery is the whole ballgame. Six high-volume days only beats four moderate days if your recovery can pay for the extra work. Run six-day frequency on four-day recovery and you don't grow faster — you stall, soften your sessions, and pick up nagging joints. If sleep or food slip, drop to the 4-day options first.
Common mistakes on the Arnold Split
- Treating it as a beginner program. The volume is the point and the trap. Without a strength base and recovery to match, you're just accumulating fatigue.
- Running double progression by habit. The classic loading here is the pyramid — ramp the weight across sets. If you flat-load everything, you've changed the program.
- Junk volume. Adding exercises until a session has eight movements with no progression metric. If you're not tracking reps and load to add overload, the extra sets are just more to recover from.
- Skipping the rest day. On a six-day split the one rest day is load-bearing. Train through it and the frequency works against you.
Run the Arnold Split automatically in LiftRing
The thing a six-day pyramid split never fixes on its own is the bookkeeping. A clipboard holds your numbers, but it can't decide the weight for each rung of the pyramid, and it won't tell you why. That's the gap LiftRing fills.
LiftRing ships the Arnold Split as a built-in program — the full 6-day chest+back / shoulders+arms / legs schedule — and it runs pyramid progression automatically. The app pre-fills the weight for every set in the ramp — top set, working sets, burnout — and gives you a one-line reason for the change, like "+5 lb — you hit all your reps." You don't program. You don't do the set-by-set math at the rack. You lift, and the pyramid moves up underneath you.
That "show the why" behavior is what separates LiftRing from a blank logbook. Apps like a plain tracker record whatever you type, cleanly enough — but you still pick every weight on every rung yourself. LiftRing picks them for you, using the pyramid baked into the program, and shows the reasoning so you can trust it or override it. Same overload you'd run by hand. It's just already running. And because it's iPhone-native, a Live Activity keeps your rest timer on the Lock Screen and in the Dynamic Island between sets.
The Arnold Split sits inside LiftRing's library of 15 built-in programs — so if you build your base on full body, move to PHUL or Upper/Lower, and graduate to the Arnold Split later, you switch in a tap instead of rebuilding a clipboard. Everything stays local-first with no account required. Sync is optional through your own private iCloud, and there's no social feed and no tracking. See how the progression engine works →
Your first 3 workouts are free with every program and feature unlocked. After that, LiftRing Pro is $4.99/month, $44.99/year, or $99.99 once for lifetime access, billed through Apple. Full pricing is on the pricing page.
Get LiftRing free →Frequently asked questions
What is the Arnold Split?
The Arnold Split is a 6-day, high-volume bodybuilding routine that pairs agonist and antagonist muscle groups: chest with back, shoulders with arms, and legs on their own — each pairing trained twice a week. It's a classic name for a training methodology, not an authored program with a fixed set, rep, and progression document. It earned a reputation as a high-volume split because it stacks two opposing muscle groups into one session and trains them with a lot of sets, twice weekly.
How many days a week is the Arnold Split?
Six days a week, with one rest day. The week runs chest+back, shoulders+arms, legs, then repeats: chest+back, shoulders+arms, legs, rest. That means each muscle group is trained roughly twice a week at high volume. Six training days is the whole point of the split, and it's also its biggest demand — the frequency only pays off if your sleep, food, and recovery can carry it.
How do you progress on the Arnold Split?
The classic Arnold Split uses pyramid progression, not double progression. You ramp weight up across your sets on a lift — a lighter, higher-rep top set to warm the pattern, heavier working sets in the middle, and often a lighter burnout set to finish. Week to week you add load to the working sets when your reps are solid. LiftRing's Arnold Split runs this pyramid for you: it pre-fills the weight for each set in the ramp and gives you a one-line reason for the change.
Is the Arnold Split good for beginners?
No — it's an advanced, high-volume split, and a beginner will get stronger faster on something simpler. Six high-volume days a week is a lot of work and a lot of recovery to manage. A new lifter does better on a 3-day full-body program like a StrongLifts-style 5×5, where each lift comes around often and linear progression adds weight every session. Build the base first, then move to the Arnold Split once you have the work capacity to use the volume.
What is the best app to run the Arnold Split?
LiftRing runs the Arnold Split for you on iPhone: it ships the 6-day chest+back / shoulders+arms / legs schedule as a built-in program, runs pyramid progression automatically, and pre-fills the weight for every set in the ramp with a one-line reason like "+5 lb — you hit all your reps." It's local-first with no account required, and a Live Activity keeps your rest timer on the Lock Screen and Dynamic Island. Your first 3 workouts are free with everything unlocked, then Pro is $4.99/month, $44.99/year, or $99.99 once for lifetime.
Keep exploring
- All 15 LiftRing programs — the full library, from full-body to splits
- Upper/Lower split guide — the 4-day split to run before the Arnold Split
- PHUL guide — power and hypertrophy on a 4-day frame
- How LiftRing works — the pre-fill-and-show-the-why progression engine
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