Every set counts.
Sets, reps, weight, RPE and cardio — logged in seconds. Follow a plan or build your own manual template.
- Plans + manual templates
- PRs and muscle coverage
- Rest timer, Live Activity, widgets
- Progress trends at a glance
Lean · 薄肌: lift, sip, sleep — the iPhone fitness app that makes consistency level up
What is Lean
Most people don’t fail to get lean because they don’t try. They fail because there’s no log, no feedback and no streak. Lean turns lifting, sipping and sleeping into three bars a day — fill them and you level up.
Lean · 薄肌 (LumaFit) is an iPhone fitness tracker that keeps strength training, calories, water and sleep in one daily view, and uses on-device pull-up counting, strength ranks and playful degrees to make progress visible.
Three pillars: lift, sip, sleep
Eat right. Drink enough.
Snap a meal and AI estimates food, portion and calories — review before saving. Log water with one tap.
- AI photo calorie estimates (Pro)
- Free manual meal log & calorie math
- Breakfast, lunch, dinner views
- Water goal and streaks
Sleep is training too.
Log sleep or import it from Apple Health, and see it next to water and training to know when to push or rest.
- Sleep duration and goal
- Optional Apple Health sleep import
- Three daily bars: Lift / Water / Sleep
- Data stays on device by default
Pull-up Exam
Prop up your phone. Begin.
The camera tracks joint landmarks live and counts pull-ups — only full reps score “Valid +1”. Six in a row earns your Lean Bachelor degree.
Pose detection runs on-device. Frames are never recorded or uploaded. Counting depends on lighting, framing and visibility.
And more
Not just a log.A training partner.
AI coach, ranks, certificates, Live Activities — consistency, designed to be opened every day.
AI COACH
An AI coach that knows your plan
Ask questions, get plans, review workouts. Two free text chats a day; consent is asked before data is sent.
AI PHOTO
Snap it. Get the calories.
Take or pick a photo; AI estimates food, portion, calories and macros. Edit, then save.
RANKS
Strength ranks that get denser
Seven material ranks from L0 Raw Stone to L6 Neutron Star, plus leanness and nutrition ranks.
TEMPLATES
Your program, your rules
No AI or Pro needed: pick moves, set sets, save your own template.
FOOD LOG
See the day’s calories at a glance
Meals by date, editable and deletable; BMR / TDEE clearly labelled as estimates.
Lean Degrees
Your lean muscledeserves a certificate.
Pass the pull-up exam to earn a degree, then share a landscape certificate, a poster or a metallic workout report — with privacy controls.
Lv.1Lean Bachelor6 bodyweight reps
Lv.2Boshi15 reps · weight ≥60kg
Lv.3Lean Postdoc20 bodyweight reps
Lean degrees are in-app entertainment achievements, not academic or professional qualifications.
6reps
Consecutive pull-ups for your first degree
2/day
Free AI text chats, no subscription needed
7ranks
Strength ranks from L0 to L6
0frames
Exam frames uploaded — it’s all on-device
Pricing
The core is free. Forever.
Free
$0
No sign-up required
- Plans, logging and stats
- Muscle coverage, PRs, history, export
- Manual meal log and calorie math
- Water and sleep tracking
- Pull-up exam and degrees
- Optional iCloud sync
- 2 AI text chats per day
LumaFIT Pro
All the AI
Monthly / yearly auto-renewing; prices shown in the App Store
- AI photo calorie & macro estimates
- AI plans and workout debriefs
- More AI coach chats
- Weight guidance & recovery insights
- AI weekly reports
- Manage or cancel any time
FAQ
Questions, answered
What is Lean · 薄肌?
Lean · 薄肌 (also known as LumaFit) is an iPhone fitness app that keeps strength-training logs, food and calories, water and sleep in one daily view, with an on-device pull-up counting exam, L0–L6 strength ranks, playful Lean degree certificates and an optional AI coach.
Is Lean free?
Yes. It is a free download and every non-AI feature is free, including plans, logging, stats, manual meal logging and calorie math, water and sleep, the pull-up exam, export and optional iCloud sync. You also get 2 free AI text chats a day. LumaFIT Pro is a monthly or yearly auto-renewing subscription for more AI features; prices are shown in the App Store.
Which devices are supported? Is there an Android version?
iPhone with iOS 18 or later. It is currently available on the China mainland App Store. There is no Android version yet.
Do I need an account?
No. All free features work without an account, and purchasing or restoring Pro does not require sign-in. Sign in with Apple is optional.
How does the pull-up exam count reps?
Prop your iPhone facing the bar; the camera tracks joint landmarks in real time and only full reps count as “Valid +1”. Front and rear cameras are supported. Accuracy depends on lighting, framing and visibility.
Does the exam record or upload video?
No. Pose detection runs entirely on your iPhone. Frames are not recorded or uploaded.
How many pull-ups for each Lean degree?
Lean Bachelor: 6 consecutive bodyweight reps. Boshi: 15 consecutive reps with a logged body weight of at least 60 kg. Lean Postdoc: 20 consecutive bodyweight reps. Degrees are in-app entertainment achievements, not academic or professional qualifications.
Level up today.
Get Lean · 薄肌 free — log a set, drink a glass, sleep well.
Download on the App StoreRequires iOS 18 or later · Currently on the China mainland App Store