ATIAMERICAN TRAINER INSTITUTE
American Trainer Institute training
AMERICAN TRAINER INSTITUTE

From zero to certified personal trainer in the USA.

Step-by-step ISSA certification prep in Portuguese — live weekly classes, small cohorts of 5 students a month, and the business training to thrive as a trainer in the USA.

Latest articles

Nine in-depth guides across training, nutrition and supplementation — in English and Portuguese.

Full-Body Strength Training for Beginners: Your First 8 WeeksTraining

Full-Body Strength Training for Beginners: Your First 8 Weeks

Forget complicated splits. Three full-body sessions a week, six movement patterns, and a simple progression plan — everything a beginner needs.

Read article →
Home Workouts That Actually Work (No Gym Required)Training

Home Workouts That Actually Work (No Gym Required)

No commute, no crowds, no excuses. A complete 30-minute full-body home session — plus how to keep making it harder as you get stronger.

Read article →
How to Build a Workout Split That Fits Your LifeTraining

How to Build a Workout Split That Fits Your Life

Push/pull/legs, upper/lower, bro split — what they actually mean, who each one is for, and how to match your split to the days you really have.

Read article →
How to Change the Way You Eat Without DietingNutrition

How to Change the Way You Eat Without Dieting

Diets have an end date — that's why they fail. Reeducação alimentar is about rebuilding habits so healthy eating becomes automatic.

Read article →
Protein Made Simple: How Much You Really NeedNutrition

Protein Made Simple: How Much You Really Need

Protein is the most under-eaten nutrient among people trying to get fit. Practical targets, the palm method, and the best sources — no scale required.

Read article →
Meal Prep for Busy People: Eat Well All Week in 2 HoursNutrition

Meal Prep for Busy People: Eat Well All Week in 2 Hours

You don't need a Sunday production line. A simple 2-hour system — proteins, carbs, veggies, assembly — that covers your whole week.

Read article →
Supplements 101: What Actually Has Evidence Behind ItSupplements

Supplements 101: What Actually Has Evidence Behind It

The supplement industry runs on hype. Here's an honest, evidence-based tier list — what works, what's promising, and what's a waste of money.

Read article →
Pre-Workout Nutrition: What to Eat Before You TrainSupplements

Pre-Workout Nutrition: What to Eat Before You Train

Training fasted, stuffed, or perfectly fueled changes everything about your session. Here's the timing, the portions, and what to avoid.

Read article →
Do You Need Protein Powder? An Honest GuideSupplements

Do You Need Protein Powder? An Honest Guide

No — but it might be the most useful supplement you don't need. When powder makes sense, whey vs. plant, and how to choose a good one.

Read article →
How to Lose Belly Fat After 35: What Actually WorksTraining

How to Lose Belly Fat After 35: What Actually Works

No, you cannot crunch it away. Here is the honest hierarchy — deficit, protein, strength, walking, sleep — that actually shrinks the waistline after 35.

Read article →
Creatine for Women: Is It Safe, and Does It Actually Work?Supplements

Creatine for Women: Is It Safe, and Does It Actually Work?

The most-asked supplement questions, answered straight: safety, bloating, dosage, hair-loss myths — and whether you actually need it.

Read article →
How to Become a Personal Trainer in the USA Without Speaking English: Complete GuideTraining

How to Become a Personal Trainer in the USA Without Speaking English: Complete Guide

Yes, it's possible. The ISSA certification allows open-book exams, and you can prepare entirely in Portuguese. Here is the full step-by-step.

Read article →

Training

Strength, home workouts and programming — build a body that works as good as it looks.

Full-Body Strength Training for Beginners: Your First 8 WeeksTraining

Full-Body Strength Training for Beginners: Your First 8 Weeks

Forget complicated splits. Three full-body sessions a week, six movement patterns, and a simple progression plan — everything a beginner needs.

Read article →
Home Workouts That Actually Work (No Gym Required)Training

Home Workouts That Actually Work (No Gym Required)

No commute, no crowds, no excuses. A complete 30-minute full-body home session — plus how to keep making it harder as you get stronger.

Read article →
How to Build a Workout Split That Fits Your LifeTraining

How to Build a Workout Split That Fits Your Life

Push/pull/legs, upper/lower, bro split — what they actually mean, who each one is for, and how to match your split to the days you really have.

Read article →
How to Lose Belly Fat After 35: What Actually WorksTraining

How to Lose Belly Fat After 35: What Actually Works

No, you cannot crunch it away. Here is the honest hierarchy — deficit, protein, strength, walking, sleep — that actually shrinks the waistline after 35.

Read article →
How to Become a Personal Trainer in the USA Without Speaking English: Complete GuideTraining

How to Become a Personal Trainer in the USA Without Speaking English: Complete Guide

Yes, it's possible. The ISSA certification allows open-book exams, and you can prepare entirely in Portuguese. Here is the full step-by-step.

Read article →

Nutrition

Reeducação alimentar, protein and meal prep — change the way you eat without dieting.

How to Change the Way You Eat Without DietingNutrition

How to Change the Way You Eat Without Dieting

Diets have an end date — that's why they fail. Reeducação alimentar is about rebuilding habits so healthy eating becomes automatic.

Read article →
Protein Made Simple: How Much You Really NeedNutrition

Protein Made Simple: How Much You Really Need

Protein is the most under-eaten nutrient among people trying to get fit. Practical targets, the palm method, and the best sources — no scale required.

Read article →
Meal Prep for Busy People: Eat Well All Week in 2 HoursNutrition

Meal Prep for Busy People: Eat Well All Week in 2 Hours

You don't need a Sunday production line. A simple 2-hour system — proteins, carbs, veggies, assembly — that covers your whole week.

Read article →

Supplements

Evidence over hype — what to take, what to skip, and how to fuel your sessions.

Supplements 101: What Actually Has Evidence Behind ItSupplements

Supplements 101: What Actually Has Evidence Behind It

The supplement industry runs on hype. Here's an honest, evidence-based tier list — what works, what's promising, and what's a waste of money.

Read article →
Pre-Workout Nutrition: What to Eat Before You TrainSupplements

Pre-Workout Nutrition: What to Eat Before You Train

Training fasted, stuffed, or perfectly fueled changes everything about your session. Here's the timing, the portions, and what to avoid.

Read article →
Do You Need Protein Powder? An Honest GuideSupplements

Do You Need Protein Powder? An Honest Guide

No — but it might be the most useful supplement you don't need. When powder makes sense, whey vs. plant, and how to choose a good one.

Read article →
Creatine for Women: Is It Safe, and Does It Actually Work?Supplements

Creatine for Women: Is It Safe, and Does It Actually Work?

The most-asked supplement questions, answered straight: safety, bloating, dosage, hair-loss myths — and whether you actually need it.

Read article →

The American Trainer Institute Shop

Programs, recipes and services to accelerate your transformation.

Personalized Training Plans

Personalized Training Plans

Ready-made workout spreadsheets for your goal — strength, home training or fat loss. Follow the plan, no consulting needed.

Coming soon
Fitness Ebooks

Fitness Ebooks

Step-by-step training programs with photos. Clear, practical, progressive.

Coming soon
Recipe Ebooks

Recipe Ebooks

High-protein, practical recipes for busy lives — with photos and macros.

Coming soon
Diet Ebooks

Diet Ebooks

Simple, sustainable nutrition guides — reeducação alimentar without extremes, with meal plans and macros.

Coming soon
Trainer Package

Trainer Package

The trainer's spreadsheet: build complete client programs in minutes, not hours.

Coming soon
Mentorship for Trainers

Mentorship for Trainers

1:1 guidance from Ana Carolina to grow your coaching business and get clients.

Join the waitlist
Done-For-You Trainer Business

Done-For-You Trainer Business

We build your website and set up your training business — you coach, we handle the rest.

Coming soon
ISSA — International Sports Sciences Association
CERTIFICATION

Prepare for your ISSA certification

We guide you through the entire ISSA Certified Personal Trainer path — registration done together, weekly live review classes and exam prep in Portuguese. ISSA certifications are among the most recognized by gyms and employers across the USA.

PERSONAL TRAINING

Train with one of our trainers

1:1 coaching with certified trainers selected by the American Trainer Institute — personalized programs, nutrition guidance and real accountability, in Portuguese or English, online or in person.

I want to train

Your personalized training plan, ready to follow

Ready-made training spreadsheets built by a certified coach — pick your goal and follow the plan, no consulting needed. Plus diet and recipe ebooks.

See the shop