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. He used a lifting app, a food app, a notes file and a spreadsheet, and none of them knew about the others.

He built the health module to close that gap, so your labs sit in the same app as your lifting. Anyone in the same position can use that tooling instead of assembling it themselves.

Why we built it

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

MuscleBuddy 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 you can read.

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.

Plenty of apps have a food log. Fewer put your training, weigh-ins, recovery and medications side by side, where a flare you log can cut that week’s training volume and a coach can see all of it.

Who it is for

People who train seriously and also have real health to manage. We treat that as one audience. 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.

That audience runs from a competitive bodybuilder in prep who needs periodization, refeeds and their own bloodwork to someone six weeks in who wants to know what to do on Monday, and the app has to work for both. Advanced tools appear as you use more of the app, or when a coach turns them on.

Coaches get first-class tools too. A coach configures methodology per client, overrides any AI suggestion, and builds reusable program templates. MuscleBuddy assists a coach, and the coach’s call wins.

How the coaching works

Rules work out the numbers, 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, so you can check them instead of second-guessing model output.

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

Grounded in the evidence

MuscleBuddy's defaults follow the science where it is clear. On debated methods (carb cycling, refeeds, reverse dieting, specific macro ratios) the app offers the options and lets you or your coach decide. A written guide cites the study behind each health or training number it gives, 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 Garrett Wilson, its founder: a longtime lifter and bodybuilder, and the engineer who built its training, nutrition, health and upkeep modules. It is operated by Garrett Makes It LLC. Guides are published under his name and cite the studies behind the numbers they give; product announcements are published as The MuscleBuddy Team.

Send questions, corrections and data-attribution issues to garrett@garrettmakesit.com. We read them, and we fix what we got wrong.