★ American Fitness · Mobile Apps
AF APPS.
Engineered tools for the athlete who doesn't stop when they leave the gym.
KETHOS
EXTENDED FASTING · DONE RIGHT
NOW ON THE APP STORE
AMERICAN FITNESS APPS
BUILT FOR PERFORMANCE
FREE DOWNLOAD
KETHOS
EXTENDED FASTING · DONE RIGHT
NOW ON THE APP STORE
AMERICAN FITNESS APPS
BUILT FOR PERFORMANCE
FREE DOWNLOAD
KETHOS
EXTENDED FASTING · DONE RIGHT
NOW ON THE APP STORE
AMERICAN FITNESS APPS
BUILT FOR PERFORMANCE
FREE DOWNLOAD
KETHOS
EXTENDED FASTING · DONE RIGHT
NOW ON THE APP STORE
AMERICAN FITNESS APPS
BUILT FOR PERFORMANCE
FREE DOWNLOAD
KETHOS
EXTENDED FASTING · DONE RIGHT
NOW ON THE APP STORE
AMERICAN FITNESS APPS
BUILT FOR PERFORMANCE
FREE DOWNLOAD
KETHOS
EXTENDED FASTING · DONE RIGHT
NOW ON THE APP STORE
AMERICAN FITNESS APPS
BUILT FOR PERFORMANCE
FREE DOWNLOAD
KETHOS
EXTENDED FASTING · DONE RIGHT
NOW ON THE APP STORE
AMERICAN FITNESS APPS
BUILT FOR PERFORMANCE
FREE DOWNLOAD
KETHOS
EXTENDED FASTING · DONE RIGHT
NOW ON THE APP STORE
AMERICAN FITNESS APPS
BUILT FOR PERFORMANCE
FREE DOWNLOAD
App 01
Live Now
★ App 01 / 03 · Health & Fitness
KETHOS
Extended Fasting, Done Right
Kethos guides you through extended fasting using science-backed timelines that track your metabolic phases in real time — from glycogen depletion all the way through stem cell activation. Choose a preset protocol built for a specific goal, or build your own fast from 24 hours to 10 days.
6 metabolic phase tracking
Goal-based preset protocols
Guided refeeding
Educational library
Symptom tracking
Streak & history
Shareable milestone cards
Zero data collection
Download on the
App Store
Free · iOS 18+
★ Kethos · 6 Fasting Phases Tracked
0 – 12h
Fed State
Body processes last meal. Glycogen stores full. Baseline phase.
12 – 24h
Fat Burning
Glycogen depletes. Fat oxidation begins. Energy shifts.
24 – 48h
Ketosis
Liver produces ketones. Body runs on fat for fuel.
48 – 72h
Deep Ketosis
Full metabolic shift. Mental clarity and fat burn peak.
72 – 120h
Autophagy
Cellular repair activates. Body recycles damaged cells.
120h+
Stem Cells
Stem cell regeneration begins. Deep immune and cellular reset.
★ Next in the Ecosystem
MORE APPS
COMING SOON.
💪
App 02 / 03
Coming Soon
American Fitness
The next app in the American Fitness ecosystem is in development. Details dropping soon.
🏆
App 03 / 03
Coming Soon
American Fitness
Third app in the AF ecosystem. In development. Stay tuned.
Download Kethos Free
Available now on iPhone, iPad & Mac · iOS 18+