Start the 25-day challenge
and join #LosCuerposDelZar
The method of Ronald Medina, the Zar del Fitness, to lose fat without losing muscle: 100% personalized training, nutrition and coaching, with results every 25 days.
01 The Zar
Venezuelan, based in Buenos Aires. Creator of the 25-Day Challenge, the engine of a brand that is now a benchmark in the fitness world of Venezuela and Argentina.
Personal trainer certified by the Pan-American Institute of Physical Education (IPEF) in exercise prescription for people with obesity and metabolic diseases. Known as a celebrity trainer for a career in show business, Ronald has assessed almost two thousand people and coaches clients online across Latin America and the world.
“When I started out I was chubby too, but I worked hard to become who I am, and now I can help others live a healthy life.”
02 Programs
Personal training in Buenos Aires or online: choose the format that works best for you. Every plan is individual and designed from your assessment.
Online · Argentina
$100,000ARS
Train at home or at the gym with videos designed for your system, at your own pace and on your own schedule.
In person · The VIP
$450,000ARS
Train directly with the Zar and two premium assistants in an exclusive gym, with hours that adapt to you.
In person · The VIP
$170,000ARS
Train directly with the Zar and the team of assistants at The VIP, whenever it suits you within the time slots.
Online · International
USD100
The same method, from any country. Follow-up on WhatsApp throughout the challenge.
03 How it works
You sign up and fill out a questionnaire about your goals, habits and history.
We analyze your starting point to prescribe a 100% individual plan.
You get your nutrition, supplementation and training plan, adapted for home or the gym.
Videos designed for your system: you train whenever it suits you, with support on WhatsApp.
Every 15 days you send us photos and your weight. We adjust the plan only when it matters for your progress.
Day 25: we measure, we celebrate and we go for the next goal.
During the challenge you'll
04 #LosCuerposDelZar
A complete assessment of your goals and physical progress to keep optimizing your training.
Whenever Zar del Fitness is available, with no restrictions.
Guidance to eat healthier and stay focused on your goal. For more professional nutrition follow-up, we recommend adding a nutritionist.
With personal training led by @zardelfitness and 2 premium assistants.
Included in the price and exclusive to this service.
Sparkling and still water.
Pre-workout, amino acids and whey protein (subject to availability).
You get into the gym without keys or cards.
For up to a week, if you travel or for reasons beyond your control.
Exclusive to premium clients.
Invite a friend to a free trial day, once a month.
Hours and location
Monday to Friday · 8:00 to 12:00 and 14:30 to 21:00
06 Career
Team
Coaching is the core of our service: we know keeping you motivated is key, so we work hard to make the journey easier for you.
Founder · Head coach
Ronald MedinaCreator of the 25-Day Challenge. The method relies on a multidisciplinary team for weight control and muscle definition.
@zardelfitness
Trainer
Edwards ChacínTrainer certified by the Pan-American Institute of Physical Education (University of Zulia). Certified in nutrition for muscle gain.
07 Frequently asked questions
Can't find your answer? Tell us and a coach will get back to you shortly.
Yes. The protocol is individual: it's designed around your goals, your level and your limitations.
Of course. Our system follows a protocol that goes from lower to higher intensity as you progress.
Yes. We design your training routine around your needs and where you're going to train.
As long as your doctor approves it. We work around your limitations to set a safe goal.
Yes, as long as a parent or legal guardian signs them up.
No, everything is progressive and individual.
Yes, we're trained professionals in personalized training.
In Colegiales, Buenos Aires, a short walk from Belgrano, Palermo and Chacarita: it's The VIP by Zar del Fitness, Ronald Medina's gym. If you don't live in Buenos Aires, you can do the 25-Day Challenge online from any country.
In the Premium System, the Zar and two premium assistants coach you closely, with fingerprint access, an orthopedic doctor, premium drinks, a pause of up to a week and a free friend once a month. The Guided General System is supervised by the assistants and shared with everyone else training at the time, with code access and no pauses.
Yes, for up to a week if you travel or for reasons beyond your control.
No. Days can't be paused for travel or for situations outside our service.
