Muscle building program: twelve weeks, three phases, every set written out

The principles behind the plan

Every line of the programme rests on a small number of findings.

• Exercise order. The ACSM recommends large muscle groups before small ones and multi-joint exercises before single-joint ones, so that the most demanding lifts are done fresh.
• Repetitions. For novices, loads that allow 8 to 12 repetitions. For hypertrophy, the ACSM places the emphasis on 6 to 12 repetitions, with one to two minutes of rest between sets.
• Volume. The meta-analysis by Schoenfeld, Ogborn and Krieger found that more weekly sets per muscle bring more growth, comparing fewer than 5, 5 to 9, and 10 or more sets. The review by Iversen and colleagues on time-efficient training sets a minimum of 4 weekly sets per muscle group.
• Frequency. The meta-analysis by Schoenfeld, Grgic and Krieger found frequency makes little difference to growth once weekly volume is matched. Choose the number of days that you can actually keep.
• Effort. Stop most sets with one to three repetitions in reserve: you could have done a few more with good form, but not many.

Phase 1, weeks 1 to 4: three full-body sessions

Alternate sessions A and B across Monday, Wednesday and Friday (A, B, A one week, B, A, B the next).

Session A

1. Goblet squat or back squat: 3 sets of 10 to 12, rest 2 minutes.
2. Push-up or bench press: 3 sets of 8 to 12, rest 2 minutes.
3. Seated cable row or one-arm dumbbell row: 3 sets of 10 to 12, rest 90 seconds.
4. Romanian deadlift: 2 sets of 10 to 12, rest 2 minutes.
5. Plank: 2 holds of 30 to 45 seconds.

Session B

1. Leg press or split squat: 3 sets of 10 to 12 (each leg for the split squat), rest 2 minutes.
2. Lat pulldown or assisted pull-up: 3 sets of 8 to 12, rest 90 seconds.
3. Dumbbell overhead press: 3 sets of 8 to 12, rest 90 seconds.
4. Hip thrust or glute bridge: 2 sets of 10 to 15, rest 90 seconds.
5. Side plank: 2 holds of 20 to 30 seconds per side.

Start with loads that leave three repetitions in reserve. The aim of this phase is clean technique and a habit of three sessions a week. The squat form and hip hinge guides cover the two lifts people most often get wrong.

Phase 2, weeks 5 to 8: more sets

Keep the same structure and the same exercises, and raise the volume.

• Main lifts (the first two of each session): 4 sets instead of 3.
• Add one exercise at the end of each session: dumbbell curl in session A and triceps pushdown or bench dip in session B, 2 sets of 10 to 15.
• Take most sets to one or two repetitions in reserve.

Each major muscle group now receives roughly 8 to 12 hard sets a week, counting the exercises that train it directly. Sessions run about 50 to 60 minutes.

Phase 3, weeks 9 to 12: heavier main lifts, and a choice

The ACSM recommends that lifters with some experience use a wider range of loads, including heavier sets. In this phase the first exercise of each session moves to 4 sets of 6 to 8 repetitions, with 2 to 3 minutes of rest. Everything else stays at 8 to 15 repetitions.

You then choose between two layouts.

1. Stay on three full-body sessions if your weeks are unpredictable. It works.
2. Move to four sessions, upper body Monday and Thursday, lower body Tuesday and Friday, if you have the time. A 2024 meta-analysis by Ramos-Campo and colleagues, covering 14 studies, found split and full-body routines produced similar gains in strength and muscle size when volume was equal. The four-day option simply makes it easier to fit more sets. For another way to split the week, see push pull legs.

How to progress from week to week

Use a double progression. Choose a range, for example 8 to 12. When you complete the top of the range on every set of an exercise, add weight at the next session, within the 2 to 10% the ACSM recommends, and start again near the bottom of the range. For bodyweight exercises, add repetitions, slow the lowering phase or move to a harder variation. If a lift stalls for three sessions in a row, check sleep and food before changing the programme. The progressive overload guide explains the options, and the one-rep max calculator helps set a working weight.

Food and recovery alongside the programme

The programme only builds muscle if the rest of the week supports it. The International Society of Sports Nutrition advises 1.4 to 2.0 grams of protein per kilogram per day for people who train. Leave at least one day between two sessions that train the same muscles hard, and aim for at least seven hours of sleep. If fatigue builds from week to week, take a lighter week with half the sets: a common coaching practice rather than a tested rule, but a sensible one. The full picture is in build muscle.

If you have a medical condition, a recent injury or have been inactive for years, ask your doctor before starting, and keep the loads light in the first weeks.

Run the twelve weeks with Never Skip Club

Twelve weeks is long enough for motivation to dip at least once. Create your free account, launch a guided session built for your level, your time and your equipment whenever the gym plan is impossible, and record your sets to see the progression week by week. Start a three-month crew with friends at three sessions a week: everyone sees who kept the rhythm, and the leaderboard rewards regularity. If you want someone to check your technique at the start of a phase, book a coach from our network or sign in to plan the week.