FitFly Engine
Adaptive fitness coaching with auto-adjusting workouts based on how you feel and what you lift.
Personalized strength training programs that adjust daily based on readiness check-ins and logged performance. Provides exercise selection, target weights, progression tracking, and meal plans tailored to your goals and equipment.
Try asking Muse: "Show me today's workout with adjusted weights based on how I'm feeling, and generate a meal plan that hits my calorie and macro targets."
Source: Found in the official MCP Registry (io.github.dropflyai/fitfly-engine) · First listed September 25, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 2 h ago.
Is it safe to connect?
What Muse can see: You sign in to your own account with it, so Muse can reach what that account allows. Read what it asks for before you agree.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
musedirectory.ai is not part of Meta. More about how Muse handles your information
How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://workout-engine-production-5dd7.up.railway.app/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 441ms. Worked in 100% of checks over 30 days.
Screening · September 25, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 10
get_todays_sessionToday's workout: exercises, sets/reps, per-exercise load guidance and concrete target weights, plus nutrition targets and cycle status. Auto-applies the user's readiness check-in (autoregulation) if they've done one today. Call this to see what the athlete should do now.readiness_checkinRecord how the athlete feels today (energy, sleep, soreness — each 1–5). The engine scores readiness and, on the next get_todays_session, reshapes the workout accordingly (reduce volume / reduce intensity / recovery day). Returns the readiness score + modifier.log_workoutRecord what the athlete actually lifted. The engine runs progression (double-progression, e1RM), detects PRs, and returns per-exercise outcomes (established/progressed/held/deloaded) with next-time targets. Weights are in kg.list_swap_optionsValid alternatives for an exercise — same muscle group, filtered to the athlete's equipment/level/injuries. Use before swap_exercise.swap_exerciseReplace an exercise with a valid same-area alternative. scope 'today' = just this session; scope 'program' = going forward. The new lift starts fresh (day-one calibration).get_programThe athlete's current multi-day program (render-ready).regenerate_programRebuild the whole program from the stored profile (~20s AI generation). Use after a profile change or a plateau.nutrition_targetsThe athlete's daily calorie + macro targets, computed from body stats, activity, and goal.meal_planA day of meals hitting the athlete's targets, USDA truth-checked (flags feasible=false with a note when macros are approximate). Slow (~15s AI call).changelogThe 'what changed & why' feed — the engine's coaching decisions (volume bumps, deloads, swaps) in Coach Fly's voice. Use to explain to the athlete why their plan evolved.Recent checks
Link
https://workout-engine-production-5dd7.up.railway.app/mcpQuestions about FitFly Engine in Muse
How do I connect FitFly Engine to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use FitFly Engine to help me. It is a free service with an MCP server at https://workout-engine-production-5dd7.up.railway.app/mcp. It needs an API key from DropFly AI; ask me to enter it through your secure credential prompt. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is FitFly Engine working right now?
At the last check (September 28, 2026, 07:46 UTC) the endpoint was working, answering in 441ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
Is FitFly Engine safe to connect to Muse?
It was screened on September 25, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can FitFly Engine do in Muse?
It exposes 10 tools, including get_todays_session, readiness_checkin, log_workout, list_swap_options. For example, you could ask Muse: "Show me today's workout with adjusted weights based on how I'm feeling, and generate a meal plan that hits my calorie and macro targets."
Follow FitFly Engine
Made this app? Claim it or get a status badge
Is this yours?
This listing was added from public sources (Found in the official MCP Registry (io.github.dropflyai/fitfly-engine)). If you build FitFly Engine, claim it to correct the details and get your badge.
Paste this on your site or README. It always shows the latest check.
<a href="https://musedirectory.ai/connector/fitfly-engine"><img src="https://musedirectory.ai/badge/fitfly-engine.svg" alt="FitFly Engine on musedirectory.ai" width="236" height="40"></a>