# phase.fitness for losing fat without losing the muscle

> In a deficit, the thing that keeps muscle is intensity, not effort. Loads stay heavy and volume comes down as recovery does — which is the opposite of what most cutting programs do, and the reason most cuts cost muscle.

phase.fitness · Strength & physique · Updated 15 October 2026 · HTML version: https://www.phase.fitness/for/fat-loss

## The short answer

phase.fitness writes a fat-loss block from the energy-deficit document: loads held at 70 to 85 per cent because heavy work is the signal that keeps muscle, volume trimmed toward maintenance as the deficit deepens, and two or three easy cardio sessions that never replace a lifting session. It also gives you the numbers around it — daily calories from Mifflin-St Jeor with an activity band from your training days, and protein set where the evidence stops rising — as targets in your profile. The maintain phase is planned from the start, because coming out of a deficit badly is where most of the result is lost.

## How much cardio should I do to lose fat?

Two or three easy sessions a week, building toward 150 minutes, in a phase.fitness fat-loss block. They are added to the lifting, never swapped for it, and placed so they do not land on top of the sessions that keep the muscle. Loads stay at 70–85% while the weekly sets come down.

## How many calories and how much protein when cutting?

phase.fitness calculates both as targets in your profile: daily calories from Mifflin-St Jeor with an activity band from your training days, and protein set where the evidence stops rising. It does not write a meal plan; it gives you the numbers, plans the maintain phase from the start, and keeps the training heavy enough to protect the muscle.

## Your week, honestly

- **The program turns into cardio.** More sessions, lighter weights, higher reps — the exact combination that spends recovery you no longer have and removes the signal that keeps muscle.
- **Nobody adjusts the volume.** The same weekly set count that worked at maintenance is too much in a deficit, and the first sign is not soreness, it is the loads sliding.
- **The cut has no end.** There is no plan for the week after the last week, so the weight comes back with interest and the training never restarts properly.

## What phase.fitness does about it

- **Heavy stays, volume moves** — Loads held at 70–85% through the block while weekly sets come down toward maintenance as recovery falls — the order the deficit document prescribes. (https://www.phase.fitness/methodology/fat-loss-training)
- **Calorie and protein targets** — Calculated in your profile from height, weight, age and training days: Mifflin-St Jeor for rest, an activity band from the week, a 20% cut, and protein where the curve flattens.
- **Cardio that is additional, not substitute** — Two or three easy sessions a week toward 150 minutes, placed so they do not land on top of the sessions that keep the muscle. (https://www.phase.fitness/hybrid-training)
- **A maintain phase, planned from the start** — Calories return deliberately and volume climbs back as recovery does — the phase most programs leave out entirely.

## Programs to start from

- [Training for fat loss: keep the muscle, lose the rest](https://www.phase.fitness/training-programs/fat-loss-training-program) — In a deficit, training preserves; it does not build. phase.fitness writes a fat-loss block the way its document prescribes — hold the load, trim the volume, keep the movements familiar, and plan the exit — instead of the high-rep burnout that removes the one signal protecting your muscle.
- [Full body, three days a week](https://www.phase.fitness/training-programs/full-body-3-day-program) — Three full-body days a week is what the frequency document recommends for the first years of lifting, and phase.fitness writes it the way it should be written: two sessions that alternate, the big patterns every time, and progression that starts session to session.
- [Upper / lower split, four days](https://www.phase.fitness/training-programs/upper-lower-split-program) — phase.fitness writes upper/lower as the four-day split the frequency document recommends for intermediates: every muscle twice a week, a strength day and a hypertrophy day for each half, and two blocks — volume, then intensity — with a deload between them.
- [General fitness program: three days, six movement patterns](https://www.phase.fitness/training-programs/general-fitness-program) — phase.fitness writes general fitness as the document prescribes: full-body, compound-led sessions that cover the body in five movements, an aerobic dose that is not optional, and progression measured in consistency first and load second.

## The apps you already use

- **Hevy** — Strength routines are written to Hevy; logged workouts return to phase.fitness. Cardio and calisthenics do not travel here.
- **Garmin** — Write it here, train it on your Garmin: strength and cardio sessions are sent to Garmin Connect and appear on the watch, and the activities you finish come back to mark the plan done.
- **Strava** — Post to Strava: the sessions you finish in phase.fitness go to your Strava feed, only the ones you choose. Nothing is imported from Strava.
- **Liftosaur** — Strength programs are pushed as Liftoscript; workout history comes back.

## The evidence

The knowledge-base documents this page is built from (The phase.fitness generator reads them for this case):

- [Resistance Training During an Energy Deficit](https://www.phase.fitness/methodology/fat-loss-training) — updated 2026-09-01
- [Daily Calorie and Protein Targets](https://www.phase.fitness/methodology/nutrition-targets) — updated 2026-09-14
- [Volume Adjustment Rules by Training Goal](https://www.phase.fitness/methodology/volume-adjustment-rules) — updated 2026-10-06
- [Deload Protocols and Recovery Strategies](https://www.phase.fitness/methodology/deload-protocols) — updated 2025-01-18

Read more in the knowledge base:

- [Managing training volume: MEV, MAV and MRV](https://www.phase.fitness/learn/posts/managing-training-volume-mrv-mev-mav)
- [Muscle protein synthesis and turnover](https://www.phase.fitness/learn/posts/protein-synthesis-muscle-protein-turnover)
- [Zone 2 training and mitochondrial adaptations](https://www.phase.fitness/learn/posts/zone-2-training-mitochondrial-adaptations)

## Frequently asked questions

### Does phase.fitness plan my diet?

No. phase.fitness calculates daily calorie and protein targets from your profile and shows them, and the training is written to protect muscle inside the deficit you choose. What you eat to get there is yours.

### Should I lift lighter while cutting?

No, and phase.fitness does the opposite. The deficit document it reads keeps loads at 70–85% and takes volume down instead, because intensity is the signal that keeps muscle when recovery is limited.

### How fast should the weight come off?

The document phase.fitness reads treats 1% of bodyweight a week as a ceiling rather than a target, and slower as better for keeping muscle. The training is written the same way whichever rate you pick.

## The only app that plans strength, cardio and calisthenics together

In a deficit the bodyweight day is cheap: skill work at low volume keeps relative strength visible while the scale moves, and it recovers faster than another barbell session would.

Right now, phase.fitness is the only training app that writes strength, cardio and calisthenics into one periodized program — same calendar, same phases, same recovery budget.

You choose the mix. A calisthenics-only plan, a cardio-only block, strength plus cardio, or all three: the phases, the end-of-phase analysis and the sync work the same way with one modality or three.

**Why calisthenics is in the plan.** Bodyweight skill work is strength training in a different shape. Straight-arm work, levers and handstands build scapular control, tendon capacity and relative strength that barbell and machine work leave untouched, and they transfer because they are closed-chain, whole-body patterns. Treated as a modality rather than a warm-up, they get sets, holds and progressions like a squat does.

No exercise catalogue on the market contains a tuck front lever, so those sessions run in the phase.fitness built-in player; strength goes to Hevy, Liftosaur or a Garmin watch, cardio to Garmin and Intervals.icu.

Build your first program: https://www.phase.fitness/signup