What does connecting an AI assistant to JustGains do?

It gives the assistant 29 tools that work on your JustGains account. 19 of them read: your workouts, your history on a lift, your programs, bodyweight and food diary. 10 of them save: workouts, programs, routes, meals and weigh-ins. You ask in plain words, and what it saves is in the app on your phone.

Which assistants work with JustGains?

ChatGPT (from its Plugins directory), Claude (from its connector directory), Grok Bot and Muse in chat. Claude Code, Codex, Cursor and VS Code in a terminal or editor. Zapier and n8n for automations. JustGains is a standard MCP server, so any other client that accepts a server address works too.

Does it cost anything?

Not on the JustGains side: the connector works with any JustGains account, free or Pro. What the assistant charges is up to the assistant: Claude includes connectors on its Free plan, and ChatGPT lists JustGains in its Plugins directory.

Do I need an API key or anything installed?

No. You give the assistant one address, your browser opens the JustGains sign-in, and you are connected. Nothing runs on your computer. The one exception is n8n, which uses a personal API key you create in your JustGains settings on the web.

What can the assistant see, and what can it change?

It works inside your own account, with three permissions: workouts, progress and profile. It can read your training, bodyweight and food diary, and save workouts, programs, routes, meals and weigh-ins when you ask. Everything it saves appears in the app, where you can edit or delete it like anything you logged yourself.

How do I disconnect an assistant?

Remove JustGains in the assistant’s own connector settings. To be certain, open your JustGains account settings and end the session listed under that assistant’s name. Each connection is separate, so ending one leaves the others alone.

How fast does something I log in a chat reach my phone?

Seconds, while the app is open: JustGains tells your devices something changed and they fetch it. If the app is closed, it is there the next time you open it.

Can I try it before creating an account?

Yes. 3 tools work signed out: searching the exercise library, generating a workout and showing one. Sign in when you want the workout saved to your account, or anything about your own training.

Is this the same as Mal, the assistant inside the app?

They share the same data and many of the same tools, but Mal lives inside JustGains: in your inbox as a chat, and behind the mic as a voice call. The connector is for the assistants you already use everywhere else. Free accounts get 3 Mal messages a day.

Your training,in the AI youalready use.

Ask ChatGPT, Claude or the assistant in your terminal to log lunch or build tomorrow’s push day. It lands in your app in seconds.

Connect your assistant See all 29 tools

Free with any JustGains account
Sign in once, no API key
Disconnect any time

Log my lunch: chicken burrito bowl with guac and a sparkling water

JustGainsLog food

The JustGains food card in ChatGPT: lunch, 735 kcal, a chicken burrito bowl, guacamole and sparkling water, with 1,385 kcal eaten today

Lunch is in: 735 kcal, and 1,385 for the day so far.

Real requests, and the cards JustGains sends back. Pick an assistant.

Pick your assistant.

All of them get the same 29 tools. Pick yours, then try the line on its card.

29tools any assistant can call.

R19 read your training
W10 save to your account
3 work before you have signed in

Workouts

WGenerate a workoutBuilds a session from a plain request, like “30 minutes, legs, dumbbells”.
RShow a workoutOpens any workout as a card you can scroll, with every set.
WSave a workoutSaves a workout you dictate: exercises in order, with sets, reps, weight and RPE.
WEdit a workoutChanges a workout’s title, notes or exercises.

History and insights

RYour recent workoutsRecent sessions with dates, duration, volume, sets and reps.
RYour logged workoutsEvery recorded session in a window, ranked by volume or duration if you ask.
RYour history on a liftEvery session and your best on one exercise.
RYour top liftsRanks your exercises by how often, how heavy and how much.
RYour progressDaily XP, volume, steps and active days for a date range.
RYour training weekWorkouts, muscle recovery and bodyweight change over a week.
RCompare your weeksThis week against the one before it.
RYour streaksStreaks, training days and workouts per week.
RMuscle recoveryWeekly sets against target for every muscle group.

Food

WLog foodSaves what you ate and returns the day’s totals. Corrections land on the same entry.
WRemove foodTakes entries out of your diary and returns the new totals.
RYour food diaryA day of your diary with totals, targets and recent foods.
RFind a foodSearches the food catalog and the foods you log most.

Programs

RFind a programSearches the program catalog, with schedules, ratings and creators.
RProgram detailsA program’s weeks and days.
RYour programsThe programs you follow, how far along you are and what comes next.
WBuild a programSaves a multi-week program written in plain text.
WStart or finish a programStarts, completes or leaves a program.

Exercises

RSearch exercisesSearches the exercise library by name, muscle or equipment.
RExercise detailsInstructions, equipment and muscles worked for one exercise.

Bodyweight

WLog bodyweightSaves a weigh-in, in pounds or kilograms.
RYour bodyweightYour weigh-ins, with the current, lowest and highest.

Routes

WPlan a routePlans a run, ride, walk or hike on real streets and paths, then saves it.

Profile

RYour profileYour units, timezone and public profile.
WUpdate your profileChanges profile fields like units, timezone and goals.

Not sure what to ask? Start with one of these.

Four starter prompts ship with the connector, so most assistants list them the moment you connect.

Plan today’s workout
A session built from what you trained this week, what has recovered and where you are in your program.
Review my week
Sessions, muscle volume, streak, bodyweight and food over the last 7 days, against the 7 before.
Why is my lift stuck?
Reads your history on one lift and says whether it has stalled, why, and what to change.
Log what I ate
Saves a meal to your food diary from a plain description and shows the day so far.

Answers come back as cards.

A paragraph about your push day is not a push day, so JustGains answers with the thing itself, in your units.

In the chatOne sentence in ChatGPT, and lunch is in your diary.

A JustGains workout card in ChatGPT: Upper Body Dumbbell Strength, with the muscles it works, the equipment it needs, a warmup and every exercise — WorkoutsMuscles worked, equipment, and every set behind a tap. Log Workout opens it in the app.

A JustGains food card: lunch at 735 kcal, each food with its protein, carbs and fat, and 1,385 kcal eaten today — MealsWhat was saved, food by food, and where the day stands against your targets.

A JustGains route card: a running loop drawn on real paths through Central Park — RoutesA run, ride, walk or hike on real streets and paths, saved for the recorder to guide you round.

One connector. Every way in.

Each tool is written once, so what one assistant can do, the rest can too.

Your assistant
You ask in plain words. It decides which tool fits.
Four doors
- /mcpChatGPT and Claude
- /connect/mcpCoding tools and MCP directories
- /grok/mcpGrok Bot
- /mcp/tools/{name}Muse, n8n and your own scripts
One sign-in
OAuth 2.1 with PKCE, in your browser. Nothing to copy and no secret to leak. Three permissions: workouts, progress and profile.
Your account
The same API the app uses, so a workout an assistant saves is a real workout. Saving twice is safe.
Your phone
Seconds.
Your devices are told something changed, and they fetch it.

You stay in charge of it.

What an assistant gets, and how you take it back.

You sign in, it never sees a password: Connecting opens the JustGains sign-in in your browser. The assistant gets a key scoped to workouts, progress and profile.
Every action has a plain name: Log food. Save a workout. Plan a route. That is what your assistant shows when it asks to run one.
Each connection is a device you can end: ChatGPT, Claude and the rest appear in your account settings by name. End one and only that one is signed out.
A retry never logs lunch twice: Saving the same meal again lands on the same entry, and a correction replaces the one it corrects.

Or skip the chat entirely.

Run JustGains on a schedule, from a webhook, or when something happens in another app.

Zapier

7 triggers, 4 actions and 2 searches. Finished workouts, runs, meals, weigh-ins and goals go out; food, water, weight and activities come in.

Your training log in a sheet
1. JustGainsWorkout Completed
2. Google SheetsAdd a row, volume in lb
Tell the group chat
1. JustGainsGoal Completed
2. DiscordSend a message
Log meals from a form
1. Google FormsNew response
2. JustGainsLog Food

Everything Zapier can do

n8n

29 operations, one for each tool. Run them on a schedule, from a webhook, or hand them to an n8n AI Agent.

Weekly recap
1. ScheduleMonday, 8:00
2. JustGainsGet Week Summary
3. SlackSend a message
Smart scale weigh-ins
1. WebhookFrom your scale
2. JustGainsBodyweight: Log
Meals from a group chat
1. TelegramNew message
2. AI AgentJustGains as a tool
3. JustGainsFood: Log

The n8n node on GitHub

And there is AI inside the app.

Everything above is JustGains reaching out. This is what is already in your pocket.

MalYour training buddy, in chat and on the mic

The JustGains workout screen during a call with Mal, in the dark theme: two sets of barbell bench press ticked at 135 lb for 5, and Mal’s line “Logged set 2 of Barbell Bench Press: 135 lb, 5 reps” with an Undo button — “135 for 5.” Said once, logged.

Mal, in your inbox
Text Mal what you ate or what you want to train. He logs the food, ticks the goal or builds the workout.
Meet Mal
One mic for the whole app
Say “225 for 8, then rest two minutes” between sets. It keeps working when the signal drops.
Type a meal, get its parts
“Three egg omelet with cheese” becomes eggs, cheddar and cooking fat, read on your phone with no signal needed.
How food logging works
Snap the plate
Photos of a meal come back as foods, portions and macros you can correct before they are saved.
Log food and macros
A body scan from your photos
A physique score, body fat with an honest range, and a map of which muscles lead and which lag.
Get your body scan
Push-ups that count themselves
Put the phone under your chest and Auto Counter counts full reps. No video leaves the phone.
How Auto Counter works
Bring a program in any shape
Paste a video link, a spreadsheet or a screenshot of your old routine, then approve each exercise match.
Import a program
A first draft for coaches
Generate with Mal drafts a plan from what a client told you. Nothing is assigned until you say so.
Generate with Mal

Where the AI stops.

A language model reads a sentence well and guesses your bench badly. So the numbers are not its job.

Your next weight: Forge works your loads out from your own logged sets. An assistant picks the exercises; the numbers on the bar come from the engine.Meet Forge
What to train today: The chips that suggest what to train next are rules over your recent workouts. Same inputs, same answer, every time.How suggestions work
Streaks, XP and records: Counted, never estimated. A PR is a PR because the set is in your log.How streaks work

It knows your runs and your sleep, too.

An assistant answers from what is in your history. These fill it in for you.

Apple HealthSteps, weight and heart rate come in. Workouts, runs and meals go back out.
Health ConnectThe same two-way sync on Android.
Garmin Connect™Runs, rides, sleep and recovery in. Workouts and routes out to your watch. Garmin guide
StravaConnect it once and the runs and rides you record there land on their own.
Apple WatchSets, rest timer and phone-free runs from the JustGains watch app.

Where it is listed.

Where a listing is still in review, the guide gets you connected today.

Official MCP RegistryListed
ChatGPT Plugins directoryGuideListed
Claude connector directoryGuideListed
GlamaListed
npm (the n8n node)Published
xAI plugin marketplaceGuideIn review

Build on it.

The same tools over MCP or plain REST, with an OpenAPI file. For your own scripts, make a personal API key in your settings on the web.

Claude Code

claude mcp add --transport http justgains https://justgains.com/connect/mcp

Codex

codex mcp add justgains --url https://justgains.com/connect/mcp

The live tool catalog

curl https://justgains.com/mcp/tools

OpenAPI 3.1

curl https://justgains.com/mcp/openapi.json

JustGains/justgains-connectorThe connector package and a local server for clients that want one.
JustGains/n8n-nodes-justgainsThe n8n community node.

The guide for yours.

Before you connect it.

What people ask before they let a chatbot near their training log.

Ask for a workout. Then go lift it.

Connect the assistant you already have open. Your first request can be the one you were about to type anyway.

Connect your assistant Create a free account