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What is Kaizer?
Kaizer is the all-in-one platform for trainers: it brings programming, tracking, chat and billing into one tool for trainers who want to scale without losing quality. Build routines by hand, reuse them, or let the AI draft the first version; when you turn it on, it adjusts weights and reps after every logged session using sets, RIR and estimated 1RM. The AI is one tool — you keep the final say.
How Kaizer's AI works, in three steps.
Kaizer reads what the client did, recalculates the estimated 1RM, and leaves the next session ready to review.
Session A · Bench pressClosed
SetKgRepsRIR
16083
26082
36082
46082
Step 01
Set logged.
Client input from the mobile app: bench press, 60 kg, 4 × 8, reported RIR 2.
Kaizer engine320 ms
72 kg
Previous 1RM
76 kg
New 1RM
NSCA tableHigh confidence
Step 02
1RM recalculation.
The AI engine recalculates the estimated 1RM with NSCA tables: from 72 kg to 76 kg, high confidence, in 320 ms.
Next session · Mon 09:00+2.5 kg
Bench press
Weight6062.5 kg
Sets4 × 6-8
ApplyEdit
Step 03
Updated plan.
Output in the dashboard for the next session: bench press at 62.5 kg, 4 × 6-8, available Monday 09:00.
Concrete example: client completes 4 sets of bench press at 60 kg with RIR 2 twice in a row. Kaizer recalculates, proposes 62.5 kg next Monday. The coach approves in one click.
How Kaizer got here.
From a personal frustration to a platform running across 20+ countries.
Founded in Buenos Aires.
Agustín Anfosso, Pedro Guarga and Octavio Serpe found Kaizer after seeing that no fitness software actually adapts the routine to the client.
MVP with adaptive AI.
First release with the post-session adaptation engine and the mobile client app.
1000+ active trainers across 20+ countries.
Expansion to Argentina, Belize, Bolivia, Brazil, Canada, Chile, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Portugal, Spain, United States, Uruguay and Venezuela.
Global consolidation and scale.
Operating across 20+ countries spanning LATAM, North America and Europe. Stripe USD/EUR enabled for coaches outside LATAM.
Who Kaizer is for.
For coaches who need programming, tracking and billing to scale without going back to spreadsheets.
- Independent trainers.Moving off Excel and WhatsApp, looking for a single dashboard for everything.
- 100% online coaches.Routines that re-adjust themselves after every session, plus built-in billing: prices in USD, charged in local currency.
- Hybrid coaches.In-person sessions + digital programming in one single dashboard.
- Studios and S&C.Pilates, CrossFit, functional, strength with 1–5 coaches and programming at scale.
Client · Sofía M.
Age29
LevelIntermediate
GoalHypertrophy
Adherence · 30d↑4%
See why coaches choose Kaizer.
What people ask us most.
What Kaizer does.5
Both. The main product is the AI coaching platform (web/SaaS) used by trainers to manage clients, program routines and bill. Your clients train in the Kaizer app (iOS/Android), where they view routines, log workouts and message you.
Trainerize, Harbiz and TrueCoach generate static routines: the plan stays until the coach manually replaces it. Kaizer recalculates each client's estimated 1RM after every workout they log (using sets, reps and RIR) and automatically updates the target weights and reps of upcoming sessions.
No, and that's intentional. The AI accelerates the coach's judgment by proposing adjustments grounded in client data. The coach approves, edits or rejects.
No. Kaizer's scope is training and programming. We don't generate macros, meal plans or supplementation recommendations.
Yes. The client-facing mobile app ships on iOS ("Kaizer: Gym & Fitness Planner" on the App Store) and Android (`app.kaizer.kaizer` on Google Play). Trainers work primarily from the web dashboard.
Plans, billing and coverage.3
Free plan forever, up to 3 clients, no credit card. Above that, Starter / Pro / Unlimited for individual coaches. All paid tiers include the automatic post-session weight and rep adjustment engine.
Argentina, Belize, Bolivia, Brazil, Canada, Chile, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Portugal, Spain, United States, Uruguay and Venezuela.
Go to kaizer.app, click 'Start free' and sign up with email or Google. In under 5 minutes you'll have your first client loaded and your first AI-generated routine.
Who we are.2
Kaizer was founded in 2024 in Buenos Aires by three founders: Agustín Anfosso (CEO; former pro basketball player who worked at tech companies Scale AI and Invisible Technologies, focused on AI since 2020), Pedro Guarga (COO & Head of AI) and Octavio Serpe (ITBA engineer, formerly at Mercado Libre).
1000+ trainers across 20+ countries, generating 120k+ adaptive routines.