Method created by Douglas Araújo, certified exercise professional
Letz combines your workouts (logged in the app or on Strava), sleep and resting heart rate from Apple Health or Health Connect, nutrition and routine with a methodology built in practice. The AI coach reads the context and proposes adjustments for the body you have today.
Your data serves your own coaching. Training plans and targets only change when you confirm.
Short sleep last night. Today: light strength and protein at breakfast. Apply?
Insights
Every insight crosses several signals, passes through the Letz method and comes out as a practical decision for your day. Not just a dashboard: a recommendation with evidence, and your confirmation.
The coach proposes swapping intervals for strength at reduced volume. You see why, and confirm before anything changes.
Basis: sleep + internal load + your own trend
The proposal prioritises two strength sessions and protein consistency, without handing back calories from a single activity.
Basis: strength training + protein + rate of change
On those days the coach offers a 28-minute session, or reshuffles the week with your confirmation.
Basis: adherence history from your own profile
Illustrative examples · the real decision depends on your data and on the coverage available
How it works
Letz joins the two: hands-on experience systematised into a methodology, applied by an AI that can see your full context.
Strava (and the watches that sync with it), Apple Health or Health Connect on your phone, meals, photos, routine and what you report. Letz brings it together without depending on a single source.
Auditable rules compute load, recovery, adherence and trends. When the data still isn't enough, the answer is “still learning”.
The AI explains the best call for today and proposes the next step. Training, calendar and targets change only when you confirm.
The maths and the safety checks follow auditable rules. The AI translates the best available finding into human language — and you stay in control of every change.
See my planDedicated protocol
People using semaglutide, tirzepatide or another prescribed GLP-1 can lose muscle along with the weight. In injection mode, your plan keeps its strength sessions, protein gets a daily floor and the coach knows which phase you are in.
The app does not prescribe, does not suggest doses and does not replace your doctor or dietitian. Strong symptoms are a reason to seek care.
Turn on injection modeYour plan keeps at least two strength sessions: that is what holds on to muscle in this phase.
A daily protein floor, split into four smaller meals that fit the appetite the injection leaves.
The hydration goal stays in view, because the injection also dulls thirst.
It talks with that context, never comments on doses and points you to care when symptoms are strong.
Who built the method
Douglas spent his career prescribing training for other people — and still had a lifelong tendency to gain weight. He knew training as well as anyone, but realised training alone wasn't the answer: methodology, nutrition and mindset had to become one system.
That's what he built, and he tested it on himself first: 16 kg down between August and November 2020. That experience became the practical base of Letz, now combined with auditable rules, published evidence and AI.
The process continuing, years later.
A personal account from the founder. Results vary, and this experience is not a promise of results for anyone else.
Scientific base
Every recommendation starts from a versioned base. The reference supports the general rule; your data shows whether it holds in your context.
Evidence guides general rules, but it does not prove any one person's outcome and does not replace professional assessment. Letz states its limits and abstains when data is missing.
Connect your data, get your 360° analysis and start with the Letz AI coach today.
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