Coaching that reacts to your data

Where it came from

MuscleBuddy started as one person's spreadsheets. Garrett was training seriously as an aspiring bodybuilder while managing health complications, mental health, and autoimmune conditions, and no product would hold both halves at once. A lifting app, a food app, a notes file, and a spreadsheet, none of which knew the others existed.

That is why the health module exists at all, and it is the answer to why a lifting app would care about your labs. The tooling got built so that anyone in the same position gets it instead of having to assemble it themselves.

Why we built it

Most fitness apps hand you a static template and leave the hard part, reading your progress and changing the plan, entirely to you. Coaches do that work well, but a good one is expensive and can't watch every set and every weigh-in.

MuscleBuddy closes that gap. It reads the data you already logged and adjusts the plan the way a competent coach would: adding weight when you clear your targets, nudging calories off a rolling weigh-in trend, backing off a lift that has stopped moving. Every adjustment comes with a plain-language reason, so you're never handed a change you can't understand.

Four modules, one system

Training generates a program around your goal, experience and equipment, then moves the load when your logged sets earn it. Nutrition moves your calorie and macro targets off your rolling weigh-in trend. Health tracks bloodwork, vitals, recovery from real HRV and resting heart rate, supplements and hormones. Upkeep holds the maintenance cadences that run on clocks longer than a day: medications, appointments, fasting windows, conditions, skin routine.

The claim is the integration, not any one module. Any competitor can add a food log. What is hard to copy is one product where the weigh-in trend that moved your calories is the same data the training engine reads, and where a rough recovery week shows up in all four places at once.

Who it is for

People training seriously who also have real health to manage. That is one audience, not two. The lifter with autoimmune flares, or medication that moves their weight, or a mental-health week that costs them three sessions, is the person this was built for.

The range inside that audience is wide and both ends matter. Comprehensive enough for a competitive bodybuilder in prep who needs periodization, refeeds and their own bloodwork. Approachable enough for someone six weeks in who just wants to know what to do on Monday. Advanced tools reveal themselves as you engage more deeply or as a coach unlocks them.

Coaches get first-class tools too. A coach configures methodology per client, overrides any AI suggestion, and builds reusable program templates. The engine assists a coach; it never overrides their judgment.

How the coaching works

The numbers are worked out by rules, on purpose. Progression (double progression, linear, RPE, percentage, wave), macro adjustments, deload timing, and phase planning all follow rules we can show you and test, not model output you have to second-guess.

AI has a narrower job here: it talks with you, reads your check-ins, and explains compound interactions in plain language. It explains and converses; it does not compute your program. That split is what lets you check the work behind every number you train and eat by.

Grounded in the evidence

Where the science is clear, MuscleBuddy's defaults reflect it. Where it is genuinely debated (carb cycling, refeeds, reverse dieting, specific macro ratios) the app presents the options without picking a winner and lets you or your coach decide. Our written guides are checked against the primary literature, and compound entries carry citations to their sources so you can read further.

MuscleBuddy is a training, nutrition, health and upkeep tool, not a medical provider. It does not diagnose, treat, or prescribe. The health and upkeep modules describe what you logged and flag values against reference ranges for your awareness: discuss anything flagged with a qualified clinician.

Who is behind it

MuscleBuddy is built and maintained by a small, independent team pairing software engineering with strength-training and nutrition practice. Editorial content is published under The MuscleBuddy Team, whose coaching and sports-science background informs every guide, and reviewed against the research rather than opinion.

We are reachable and accountable: questions, corrections, and data-attribution issues go to garrett@garrettmakesit.com, and we fix what we get wrong.