The Best Racing Memories Don't Happen Alone

I train for races with my wife, my brother, and a group of friends. The finish line gets a photo. The months of training and memories get lost in a group text. I built Endurance Grid so the whole journey gets celebrated, not just the last mile.

Phil and five friends in Endurance Grid shirts with their race bibs after Run(317) Carmel

Our crew · Run(317) Carmel

Phil Tarnowski

Founder · Indianapolis, IN

LinkedIn

I’ve Always Enjoyed Training for Something

Phil at HYROX Atlanta

HYROX · Sled Pull

Growing up, I competed in basketball. Practices, drills, games, and camps. That competitive nature was a big part of my life. When that ended, I still had that drive. The need to train for something, compete at something, push myself toward a fitness goal I cared about. I lifted weights, played intramural sports, ran, and still found myself wanting to compete further.

Half marathons were a natural first step. They were hard, they had a finish line, and they gave me something to work toward. Over time, I found more options where I could mix strength training with endurance sports, and train with other athletes like I did in basketball. Discovering sprint triathlons changed things. Then HYROX changed them again.

Every time I found a new sport, it happened by accident. A friend mentioned it, or I stumbled across a race listing. There was no single place that showed what was out there, what it felt like, or how to get started.

Looking back, the races I remember most are the ones I trained for with someone.

Built for the People Who Train Beside You

The finish lines are life changing, but so is everything leading up to them: the training, the texts, the memories, and the shared experience of accomplishing something with someone else. We exist to help you capture that journey so you can look back on it with the people who were there.

Phil and his wife after the Mini-Marathon, her medal around her neck
My wife · Running and triathlons
Phil and his brother at HYROX in Endurance Grid shirts
My brother · HYROX and running

My Racing Journey

The app is based on my experience training for and completing races. I've done the training, learned what worked (and what didn't), and finished races.

Along the way, I earned multiple National Academy of Sports Medicine (NASM) personal trainer certifications because I genuinely care about fitness, longevity, and living a healthy life.

HYROX Doubles Atlanta

HYROX Doubles · Atlanta · 1:15:05

Running

5× Half Marathons

13.1 miles

Running

Countless 5Ks + 4× Short Course Races

10-Miler · 10K · 6-Miler

Trail Running

1× Trail Half-Marathon

13.1 miles

Triathlon

2× Triathlons

Sprint

Duathlon

1× Duathlon

Sprint

HYROX

2× HYROX Doubles

Open · Pro

HYROX

2× HYROX Doubles Simulation Races

Open

Road Cycling

1× Road Cycling Race

12.5 miles

Credentials

NASM Certified

NASM-CPT · Stretching & Flexibility · Sports Nutrition

Our Mission

Help people become the healthiest versions of themselves by exercising and celebrating the journey with the people they care about.

That means habits that keep you healthy for decades, not just one season. It's more fun with your partner, your family, or your friends.

The person training for their first 5K and the person training for their third HYROX both belong here. So does the friend who just wants to walk more. Every goal is better with your people.

How We Deliver Our Mission

Athletes first. Always.

Everything we build starts with one question: does this make training and racing better for you and the people you do it with? If not, we don’t build it.

Built for creating memories and having fun.

Training is better when it’s shared. Every workout, race, and photo becomes part of a story you can look back on and celebrate.

We're part of this community

We're not covering this from the outside. We train, race, and toe the same start lines you do. We built Endurance Grid because we wanted it to exist for us too.

Start Your Journey With Your People

The app is in beta, and we’re letting people in a few at a time. Start a group for your next race and bring your people with you.