The short answer
If you are above 20% body fat as a man (or above 28% as a woman), cut first. If you are below 12% (men) or 20% (women), you are too lean to grow well; bulk. If you are in the middle, maintain or recomp and let your training history make the decision for you.
That decision changes everything else. Cut, bulk, and recomp are not the same protocol with a different calorie number.
Why the starting point matters more than the goal
Bulking on top of high body fat means you gain mostly fat. Cutting from too lean means you lose muscle and stall your training. The principle is well-supported across the body composition literature: the lower your starting body fat, the smaller the share of weight gained that is lean mass, and the higher your starting body fat, the smaller the share of weight lost that is fat (Source: Forbes, Lean body mass-body fat interrelationships in humans, Nutr Rev, 1987; and Helms et al., Evidence-based recommendations for natural bodybuilding contest preparation, J Int Soc Sports Nutr, 2014).
Translation: phases work best when you keep your body fat inside a range that lets each phase pay off.
How to choose your phase
| Starting body fat | Recommended phase | Reason |
|---|---|---|
| Men >20%, women >28% | Cut | Improve insulin sensitivity, set up a productive bulk later |
| Men 12 to 20%, women 20 to 28% | Maintain, recomp, or short cut | Most flexible window |
| Men <12%, women <20% | Bulk | Hormonal and recovery cost of staying lean outweighs the leanness benefit |
For most adults, alternating 3 to 6 month phases is more productive than running either direction for a year.
Cutting: how to do it well
Set the deficit
Aim for 0.5 to 1% of body weight per week. For a 180 lb adult, that is 0.9 to 1.8 lb per week. The math:
- 1 lb of fat ≈ 3,500 calories.
- 1 lb per week = 500 cal/day deficit.
Use the calorie calculator to get a starting target.
Protein floor: non-negotiable
Protect lean mass with 0.9 to 1.2 g of protein per pound of body weight. See the protein intake guide for the full breakdown.
Training stays heavy
The biggest mistake in a cut is dropping training intensity. Lean mass is preserved by load, not by reps. Keep 80% of your top sets. Drop accessory volume if you must.
Cardio is a tool, not a strategy
Use cardio to extend a stall, not to power the deficit. A simple rule: only add cardio when food cuts stop working, and add 10 to 15 minutes of low-intensity work, not 45.
When to end the cut
End the cut when one of three things happens:
- You hit your goal body composition.
- Performance in the gym drops two weeks in a row despite adequate sleep.
- You have been cutting for 12 to 16 weeks. A diet break of 1 to 2 weeks at maintenance is rarely a setback and often a reset.
Bulking: how to do it well
Set the surplus
A small surplus is the entire game. 0.25 to 0.5% of body weight per week is the right pace for natural lifters with more than 1 year of training history.
- 180 lb lifter: 0.45 to 0.9 lb per week.
- Roughly 250 to 500 cal/day above TDEE.
If you are gaining a pound a week, you are gaining fat you will have to cut off later. The "dirty bulk" produces mostly worse results than a controlled lean bulk in trained lifters (Source: Garthe et al., Effect of two different weight-gain rates on body composition and strength gain in elite athletes, Int J Sport Nutr Exerc Metab, 2013).
Train for hypertrophy, not just strength
In a surplus you have the recovery capacity to push volume. Add a set or two to your hardest exercises. Train each muscle 10 to 20 hard sets per week.
Track lifts and waist together
If your bench press climbs and your waist stays flat, the bulk is working. If your waist is climbing faster than your lifts, you are gaining fat. Tighten the surplus.
When to end the bulk
End the bulk when:
- You have gained 8 to 15 lb (roughly 5 to 10% of bodyweight) over 4 to 8 months.
- Your waist has crossed your personal threshold.
- Lifts have stopped progressing for 4 to 6 weeks despite proper sleep and nutrition.
Then take a maintenance phase or a short cut. Bulking forever is how you end up at 25% body fat and wonder why your bench is flat.
Recomp: the underrated option
If you are new to lifting, returning from a break, or in the middle body fat range, recomp (gain muscle and lose fat simultaneously at maintenance) works. The conditions:
- Train hard, consistently, 3 to 5 days per week.
- High protein (0.9 to 1.0 g/lb).
- Calories at or very slightly below maintenance.
- Patience. Recomp is slower than dedicated phases, but the body composition outcome is often better for the right person.
The rate-of-change rules
| Phase | Target weekly rate | Stop or adjust if |
|---|---|---|
| Cut | 0.5 to 1% of bodyweight lost | Lifts drop two weeks running |
| Lean bulk | 0.25 to 0.5% of bodyweight gained | Waist climbs faster than lifts |
| Recomp | 0 to ±0.25% per week | No measurable progress in 8 weeks |
Common mistakes
- Switching phases too often. A two-week cut is not a cut. Give each phase 8 to 16 weeks.
- Skipping the maintenance phase. Going cut to bulk to cut burns out adherence. Hold maintenance for 4 to 8 weeks between phases.
- Eyeballing the surplus. Most "lean bulks" are actually dirty bulks because the math was never checked.
- Following the same training in every phase. Volume and intensity should shift with calories.
How Fitly automates the phase math
Set your phase target in Fitly and the calorie target, macro split, and weekly trend dashboards adjust automatically. The Smart Coach flags when your rate of change is off plan so the adjustment is obvious.
Set your macros Set your calorie target