Key facts
- Run in a caloric surplus to build muscle.
- A 'lean bulk' uses a small, controlled surplus.
- Paired with progressive resistance training.
- Usually followed later by a cutting phase.
Bulking is the muscle-building half of the classic cycle. By eating more calories than you burn and training hard, you give your body the energy and stimulus to add muscle. Some fat gain is expected, which is why a 'lean bulk' — a modest surplus of around 250–500 kcal — is usually smarter than eating with no limits.
The goal is to gain at a controlled rate, mostly muscle, then eventually switch to a cutting phase to reveal it. Tracking your weight trend and adjusting intake keeps a bulk productive rather than just adding fat you'll have to diet off later.
Frequently asked questions
How fast should I gain weight when bulking?
Slowly — often around 0.25–0.5% of bodyweight per week. A controlled pace keeps more of the gain as muscle and limits unnecessary fat.
Should I do a lean bulk or a dirty bulk?
A lean bulk (modest surplus) is usually better. A 'dirty bulk' with a huge surplus adds weight fast, but a larger share is fat you'll need to cut later.
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