How to build muscle,
and what actually matters.
Muscle is built by giving a muscle more work than it is used to, repeatedly, while eating and sleeping enough to repair it. Nearly everything else people argue about is detail sitting on top of those three things.
1. Progressive overload is the mechanism
If the work never increases, there is no reason for the body to change. Overload can come from more weight, more reps at the same weight, more sets, better control, or shorter rest. Weight is simply the easiest to measure. This is covered in depth in the progressive overload guide.
2. Enough protein
Protein supplies the raw material. Aim for the top of the 1.4 to 2.0 g per kg range when building, so around 2.0 g per kilogram of bodyweight. See the protein guide for the detail.
3. A small calorie surplus
Building tissue takes energy, so eating slightly above maintenance helps. Slightly. The rate at which you can add muscle has a ceiling that eating more does not raise, so a large surplus mostly adds fat. Somewhere around 150 to 325 calories above maintenance is a sensible band, depending on how fast you want to move.
What matters less than people think
- Exercise selection
- Beyond covering the major patterns, the specific movement matters far less than whether you progress it
- Training to failure every set
- Useful occasionally, costly as a default, because it eats into recovery
- Supplements
- Creatine has good evidence behind it. Most of the rest is expensive urine
- Meal timing
- Daily totals dominate. The anabolic window is far wider than it was sold as
Recovery is where it happens
Muscle is repaired between sessions, not during them. Training hard on very little sleep mostly buys fatigue. If your sleep is genuinely poor, fixing that will do more than changing your programme.
How long it takes
Slower than the internet suggests. Beginners gain fastest, and the rate slows as you get closer to your genetic potential. Training age, sleep, food and consistency all move the number, which is why nobody can honestly tell you what you will gain in ninety days. Ninety days gives you time to practise and assess progress, but cannot guarantee a habit or improvement in the lifts.
The part that decides it
Turning up for months. A mediocre programme done consistently beats an optimal one done for three weeks, every time.
Check a programme before committing to it
Look for named movements, set and rep ranges, a way to progress and enough time between demanding exposures to the same muscles. The upper/lower plan makes that structure visible before you fill in the intake. A list of exercises without a progression rule leaves the central decision to you.
A worked example of useful progress
If you press the same dumbbells for 10, 9 and 8 controlled reps this week and 11, 10 and 9 next time, your performance has improved. You do not need to add weight every visit. Once every set reaches the top of the prescribed range, use the smallest available load increase and expect repetitions to fall toward the bottom of the range.
Separate training progress from scale changes
Body weight can rise from water, food in the digestive system and fat as well as muscle. A heavier scale reading after a few days does not establish muscle growth. Review your exercise log, measurements taken consistently and longer-term weight trend together. If body weight rises while performance stalls, first review food intake, technique and recovery rather than assuming a larger surplus is the answer.
What the builder's surplus means
Phasebuilt adds 150, 225 or 325 kcal to its maintenance estimate for the gentle, steady or ambitious muscle-building options. These are product defaults, not a measured surplus requirement. A maintenance estimate can be wrong, so the resulting number is a starting point for observation rather than a guarantee. The builder selects 2 g protein per kg; distributing that across meals can make it easier to eat consistently.
Evidence and scope
These are educational examples for healthy adults, not individual prescriptions. The examples are constructed to explain decisions, not reports of user results. Phasebuilt publishes this guidance; no clinical review is claimed. See our method and limitations and report a correction.
Updated 5 October 2026. Examples and implementation notes by Phasebuilt.
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