Open Workout System
Your fitness stack, open source.
Focus your efforts where they matter most. Train with our assistant or connect your own agents, track what you need, and own your data. No subscriptions required. No lock-in. No black boxes.
Everything you need. Nothing you don't.
Dynamic Workouts
All workouts and schedules effortlessly adapt to your needs and schedule. No rigid structures. You get what you need when you need it.
Personal Trainer
Sees the full picture. Every exercise, meal log, and metric. Creates training plans, logs meals, monitors progress, and provides research-backed guidance. Just ask.
Nutrition Tracking
Quick macro logging from the command bar. Type "I just ate an apple", or type "/cal 500 p:30" and keep moving. No app-switching, no friction.
Body Composition
Physics-based projection engine. See where you'll be in 12 weeks based on your actual training, protein intake, and metabolic rate.
Route Planning & GPS
Plan running and cycling routes on a map. Track your sessions with live GPS. Elevation profiles, split times, the works.
Open Source
Open sourced activity library, API, hardware designs, and more. Fork it, modify it, self-host it. MIT + CERN-OHL-S licensed.
Your Choice
Built-in Assistant. Or Bring Your Own Agent.
Use the built-in assistant that already knows every tool in the system, or connect your own agent remotely and give it the same power. Either way — creating exercises, logging nutrition, building programs, tracking progress — it all runs through the same 37-tool interface.
Built-in Assistant
Powered by Grok. Understands your entire fitness profile, takes action on your behalf, plans multi-step tasks, and learns your preferences over time. Just open the chat and ask.
Remote Agent API
Generate a bearer token and let Claude, GPT, or any custom agent call the same tools via HTTP REST or MCP. Native MCP support for Claude Desktop, Claude Code, and Cursor — or use the REST API from any language.
REST /api/remote/tools · /execute · /context
MCP stdio transport · tools + resources
Community-Powered
The Activity Library
Think Wikipedia for exercises. A growing, crowdsourced database of activities, each with detailed instructions and more. Extensible parameters. muscle activation maps, auto-generated thumbnails, step-by-step images, and video animations. Contributed by users, enriched by AI, reviewed by humans.
- •Thousands of exercises with full metadata and visual guides
- •AI driven management, procurement, and mediation of user contributions
- •Open API — any app or device can read from and contribute to the library. Community contributions means open library as it should be.
- •Auto-generated thumbnails, and animation videos for every exercise which can be overridden by user contributions to ensure accuracy.
- •External links for instructional references and research publications in relation to the activity.
Conversational
Your Assistant Trainer
It understands your entire fitness journey — training history, nutrition, goals, injuries. It takes action, plans before it acts, verifies its work, and learns your preferences over time.
// 37 tools, one interface
Every action the assistant takes — creating exercises, logging meals, building programs — uses the same tool system available to external agents via HTTP REST or MCP. Same capabilities, whether it's the built-in trainer or your own agent.
Developer-Friendly
Built for Integration
Open APIs for everything. Connect your own hardware, build your own UI, pipe data into your own systems. The platform is the foundation. What you build on top is up to you.
Activity Library API
Read and contribute exercises, sessions, and routes. Full CRUD with metadata, images, and search.
Hardware Integration API
Wireless protocol for connecting to and controlling resistance devices, scales, wearables, and custom sensors. Real-time force, weight, and heart rate streaming.
Remote Agent API
Call the same tools via HTTP REST or MCP (Claude Desktop, Claude Code, Cursor). Query data, create exercises, log workouts, and manage programs on your behalf.
Open Hardware
Software Meets Hardware
We're building open source fitness hardware too. A motorized resistance device that replaces a full rack of dumbbells. A compact rowing system. A compact paddle boarding setup. A smart balance scale. All open source, all designed to seamlessly integrate with this platform.
We also expose and make our hardware API open-source for any fitness hardware developer to support. Want your favorite equipment supported? or contribute a device descriptor.
Coming Later
These features are on the roadmap but not yet built. Everything here is subject to change based on community feedback and priorities.
Coaching Marketplace
Connect with certified trainers who can build programs and review your form. Remote trainer features.
Group Challenges
Compete with friends or the community. Weekly challenges, leaderboards, shared goals.
Local Fitness Finder
Make and discover events. Connect with other in your local community.
Supplement Marketplace
A new dynamic subscription model adapting to your real needs. No lock-ins or pushy subscriptions here. Everything you need, when you need it, nothing you don't