Four workouts a week: how to split the muscle groups

Four sessions a week is the point where most people have to make a real decision for the first time. On three days you can train the whole body every time and the schedule sorts itself out. Add a fourth day and that logic starts to creak: your legs are permanently half-tired, your shoulders never feel fresh, and the thing you actually wanted to improve never gets its turn.

The useful question isn't which split is best. It's how to give every muscle group enough sets in the week and enough time in between to recover. Here is what that looks like in numbers, in a weekly schedule, and inside a single session.

Step 1: decide how much work each group needs

The unit isn't "chest day". It's the number of hard sets per muscle group per week. A hard set means you stopped 0–3 reps short of failure, not that you stopped because the set looked good on paper.

For most people the working range is 10 to 20 hard sets per group per week. Under a year of training, 10–12 is plenty and you'll still add weight. If you've been at it longer and progress has stalled, 15–20 makes sense — on the one or two groups that lag behind, not on everything at once.

The second number is frequency. The evidence is strongest for splitting the weekly volume across two sessions rather than dumping it into one. Ten sets for back done as two lots of five are simply better sets than ten in one go, where the last three are mostly fatigue rather than stimulus.

That's why four days sit so neatly on any split that brings each group back twice a week.

Step 2: pick one of three splits

Upper/lower, twice through. Upper, lower, rest, upper, lower. This is the safest choice for most people: every group gets hit twice, the volume is easy to count, and the days don't overlap. If you want it laid out week by week, we have a full upper/lower guide with an eight-week plan.

Push/pull, twice through. Push day is chest, shoulders and triceps plus a squat or split squat; pull day is back, biceps and hamstrings plus a Romanian deadlift. Legs are divided by movement rather than by day. It suits people who don't want a heavy squat and a heavy deadlift sitting next to each other in the week.

Three plus one. Three full-body sessions and a fourth day aimed only at what's behind — usually shoulders, arms, trunk or grip. This works if full body already suits you; if it doesn't yet, start with full body three times a week and add the fourth day once the first three are a habit.

All three work. The difference between them is small compared with the difference made by sticking to one of them for three months.

Step 3: place the days across the week

Two rules cover it. Leave at least 48 hours between sessions that hit the same group. And don't put a heavy leg day the day before a session with deadlifts or heavy rows — your lower back won't be ready.

• Mon / Tue / Thu / Fri — two blocks of two, weekend clear. Fine for most people.
• Mon / Wed / Fri / Sat — the most recovery room. Better if you do physical work or you're past forty.
• Tue / Wed / Fri / Sun — if Monday never actually happens, stop forcing it.

Fixed days beat perfect days. A schedule that shifts every week quietly becomes three sessions, then two.

Step 4: fill in a single session

Six to eight exercises per session is the ceiling before quality drops. The order never changes: one big compound while you're fresh, then a second compound, then two to four isolation moves. That's 60–75 minutes.

An upper day looks like this:

• Bench press: 4 sets of 5–8 reps
• Pull-up or lat pulldown: 4 × 6–10
• Overhead press: 3 × 8–12
• Barbell or cable row: 3 × 8–12
• Lateral raise: 3 × 12–20
• Curl and triceps extension: 2 × 10–15 each

And a lower day:

• Squat: 4 × 5–8
• Romanian deadlift: 3 × 6–10
• Lunge or Bulgarian split squat: 3 × 8–12 per leg
• Leg curl: 3 × 10–15
• Calf raise: 3 × 10–15
• Trunk work: 2–3 sets, for example the hollow hold or dead bug

The second upper and second lower day are not copies of the first. Shift the emphasis: if the first upper day was heavy pressing at 5–8 reps, run the second at 8–15 with more pulling. If the first lower day led with a squat, let the second lead with a hip hinge. Every group still gets its 10–20 sets, but your joints don't take the same hit twice.

Step 5: progression, so week 8 doesn't look like week 1

The simplest rule that works is double progression. Set a rep range, say 3 × 8–12. When all three sets hit 12 clean reps, add 2.5 kg on upper-body lifts or 5 kg on lower-body lifts next time and drop back to the bottom of the range.

Judge it by numbers, not by feel. In the first year, 2.5–5 kg a month on the big lifts is realistic; later, considerably less. If three weeks pass with no extra rep and no extra kilo anywhere, the problem is usually outside the gym: sleep, food, or too many sets.

Every 6–8 weeks take an easier week — same exercises, half the sets, around 70% of the weight. It isn't a wasted week; it's why the next block starts higher.

Common mistakes

Four days, three days' worth of volume. People add a day but never redistribute the sets, so session four turns into 40 minutes of arms and abs. Count the sets per group first, then fill the days.

Twice as much pushing as pulling. Two days of bench and overhead press, one day of back. Keep the weekly push-to-pull ratio at 1:1 at minimum, and closer to 1:1.5 in favour of pulling if you sit at a desk all day. It's also one of the few things that genuinely helps shoulders stay healthy.

Every set to failure. It feels committed and it wrecks the next session. Leave 1–3 reps in reserve on compounds and save failure for the last set of an isolation move.

The same running order for months. If lateral raises are always last and always 8 kg, they never progress. At least once a fortnight, move something from the back of the session to the front.

Changing the plan every two weeks. You can't judge a programme before 6–8 weeks. Before that you have impressions, not data.

Nothing for the trunk or lower back. Ten minutes a week on trunk and hinge work is cheap insurance; if your back already grumbles, read what actually helps with preventing back pain.

When to see a doctor

Being tired and sore for a day or two afterwards is normal. These aren't: sharp pain in one spot lasting more than two weeks, pain radiating down an arm or leg, numbness or weakness, a swollen joint, and chest pain, dizziness or breathlessness during effort. Stop that exercise and see a doctor or physiotherapist before you carry on. The same applies if you have heart disease or high blood pressure, or you're coming back from surgery — the plan should go past someone who knows your history first.

Common questions

Is four days better than three?

Only if you actually do all four. Four days give you more room for volume and make two sessions per muscle group easy to arrange, but three sessions you complete beat four that quietly become two.

What if I miss a session?

Pick up where you left off rather than skipping ahead. If you miss a lower day, the next session is that lower day, even if the week ends up with three. Never merge two sessions into one day.

Where does cardio fit?

After the lifting or on a separate day. Two or three easy 20–30 minute sessions a week won't cost you strength. Hard intervals the day before legs will.

Can I add a fifth day?

Once you've completed eight straight weeks of four without missing any. A fifth day works best as a short weak-point session, 25–35 minutes, with no heavy compounds in it.

The short version

• Aim for 10–20 hard sets per muscle group per week, split across two days.
• Choose one split: upper/lower twice, push/pull twice, or three full-body days plus one top-up day.
• Leave 48 hours between sessions hitting the same group, and keep your training days fixed.
• Six to eight exercises per session, compounds first, 1–3 reps left in reserve.
• Progress with double progression and take an easier week every 6–8 weeks.
• Don't change the programme before eight weeks — until then you have nothing to judge it on.