AI assistants

Gravitus in ChatGPT and Claude

Ask your AI assistant for a training program, or ask how your lift compares with other lifters. Gravitus answers with programs built from its exercise library and with strength data from workouts logged by Gravitus members. You do not need an account to use it.

Updated October 1, 2026

Server URL

https://gravitus.com/mcp/

Authentication: none. The same URL works in ChatGPT and Claude.

What it does

Build a training program

Tell the assistant your goal, your experience, how many days a week you train (1 to 6), how long each session is and what equipment you have. If an area such as your knees or lower back is sore or injured, say so and Gravitus builds around it.

Gravitus builds a 4 to 16 week program with exercises, sets, reps and rest for every training day. A build usually takes 15 to 30 seconds. The finished program appears in the chat with a gravitus.com link where you can view it and save it to your account. ChatGPT and Claude can also show a program card that fills in as the program builds.

See how a lift compares

Ask how strong a lift is and Gravitus compares it with estimated one-rep maxes logged by Gravitus members of the same sex. The answer gives your percentile and, if you share your bodyweight, your strength level and where the next level starts.

Ask without a weight to get the average for men or women. Answers come in pounds or kilograms, with a link to the full strength standards table.

Bench press
Squat
Deadlift
Overhead press
Barbell row
Romanian deadlift
Incline bench press
Front squat

The assistant does not use Gravitus for single one-off workouts, running or cardio-only plans, nutrition, or medical rehabilitation.

Example prompts

Make me a 4 day upper lower split for strength. I'm intermediate, about 60 minutes a session, full gym.
Program
I only have dumbbells and a bench at home and my lower back is a bit sore. Can you build a 3 day full body program to build muscle? I'm a beginner.
Program
Build me a 5 day push pull legs routine for hypertrophy, intermediate, 45 minute sessions.
Program
Is a 225 bench good? I'm a 180 lb guy.
Lift
What's the average squat for a woman, in kg?
Lift

Save a program to the Gravitus app

Open the gravitus.com link that comes with your program.
Select Save to my account, then sign in or create a Gravitus account.
Open Gravitus on iPhone or Android and sign in with the same account. The program is waiting in Programs.

The link works for 30 days. Saving is optional, and you can follow the program from the chat without an account.

Add Gravitus to your assistant

ChatGPT

In ChatGPT, open Settings, then Security and login, and turn on Developer mode. Whether you can turn it on depends on your plan and workspace.
In ChatGPT's plugin settings, add a new plugin named Gravitus. Choose a public endpoint, enter https://gravitus.com/mcp/ and set authentication to none.
Start a new chat, add Gravitus from the tools menu and ask for a program.

Claude

On claude.ai or in Claude Desktop, open Customize, then Connectors. Select + and then Add custom connector.
Name it Gravitus, enter https://gravitus.com/mcp/ and select Add. Claude does not ask you to sign in.
In a new chat, open +, then Connectors, and turn on Gravitus.

On Team and Enterprise plans, an Owner adds the connector under Organization settings, then Connectors, and members connect it from Customize. Free plans can add one custom connector. A connector added on the web or in Desktop also works in the Claude mobile apps.

Gravitus may also become available in the ChatGPT and Claude directories. Once it is listed, you can add it from the directory without entering the server URL.

Tools

build_program
Starts building a program from your answers and returns a link to view and save it. Creates an anonymous program on Gravitus, reachable only through that link.
get_program
Returns the finished program as text, with every day, exercise, set and rep. Read only.
lookup_strength_standard
Returns the percentile, strength level or average for a lift by sex and bodyweight. Read only.
get_program_draft
Used only by the program card to check whether a program has finished building. Read only.

Data and privacy

Programs you build: Gravitus stores the program and the preferences you gave to build it (goal, experience, schedule, equipment, any injuries or limitations, and any requests you typed) so you can open it on gravitus.com. If you do not save it to a Gravitus account, the program and those preferences are deleted after 30 days. If you save it, it becomes part of your Gravitus account and is handled like the rest of your account data.
Strength lookups: Your bodyweight and the weight you lifted are used to answer that one question and are never stored.
Usage log: Gravitus keeps an anonymous log of each request: which tool was used, whether it worked, how long it took, which assistant sent it, a one-way hashed version of the anonymous id the assistant provides, language, country, and for strength lookups the lift and the resulting percentile. The log is not linked to you unless you save a program to your Gravitus account, which links that program's requests to your account.
What Gravitus does not receive: Gravitus does not receive your name, email, account details or your conversation with the assistant, only what the assistant sends to Gravitus for each request.
Your assistant: The AI assistant's own privacy policy covers what it does with your conversation.

Read the full Privacy Policy and Terms of Service.

Limits

Gravitus applies fair-use limits so the service stays fast for everyone. There is a daily limit on how many programs one person can build, a limit on builds running at the same time, an overall daily limit across all users, and a per-minute limit on strength lookups. When you reach a limit, the assistant tells you and you can try again later.

Asking for the same program again within a short time returns the program already built instead of starting a new one.

Support

For questions or problems with Gravitus in ChatGPT or Claude, email support@gravitus.com. If your question is about a specific program, include its gravitus.com link.