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Doctors told physician and competitive runner Danny Grossi he might never walk again after a life-threatening blood clot and severe compartment syndrome. Today, he is not only back to running, but he is revolutionizing the sport.

In our latest episode of the Athletics Ontario Running Podcast, Danny shares his unbelievable journey of resilience. We dive into his decades-long medical sidelining, his miraculous return to racing in his 50s, and how his grueling rehab journey inspired him to build PIRX—an AI-powered training app designed to help runners optimize their performance.

This is a powerful story of turning the ultimate setback into a technological breakthrough to help athletes reach their potential.

Tap the link in our bio to listen now! 🎧

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Doctors told physician and competitive runner Danny Grossi he might never walk again after a life-threatening blood clot and severe compartment syndrome. Today, he is not only back to running, but he is revolutionizing the sport with PIRX—an AI-powered training app designed to help runners optimize their performance.

Check out this #podcastclip from our next episode of the Athletics Ontario Running Podcast with Danny!

Tap the link in our bio to subscribe now! 🎧

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What could you actually run right now? Find out in seconds. Free. ⏱️

We just opened a free, lighter version of the PIRX Time Predictor to everyone. It’s a quick, simpler take on the more robust predictive engine inside our app. Add one recent result, enter any distance, and get your projected finish plus the three drivers behind your time. No signup. No watch. No catch.

Here’s the challenge 👇
1️⃣ Run your number at the link in bio (pirx.ca/race-predictor)
2️⃣ Come back and drop your predicted time in the comments
3️⃣ Tag the runner you’re chasing and settle who’s faster

Then screenshot your result, share it to your story, and tag @pirx.app so we can cheer you on. Save this post and come back after your next race to see how close we got.
One recent run is all it takes. What’s your number? 👇

#RunningCommunity #RunnersOfInstagram #MarathonTraining #RunningMotivation #InstaRunners

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We told 98 runners how their race would end before they ran it.

On average, we missed their actual finish by 11 seconds.

Not a simulation. Not a “projected time” from a pace calculator.
Real start lines, real conditions: wind, tactics, championship pressure, the lot. 97.3% accurate. 5 races called to the exact second. And every single validated athlete finished inside the range we gave them.

Most apps tell you what you just did.
PIRX tells you what you’re about to do.

📌 Save this for your next race-day gut check.

💬 Drop your next race + goal time below. Let’s see how close we’d get.

🔁 Tag the training partner who swears they “have no idea” what they’ll run.

Predict better.
Race smarter.

#RunningCommunity #MarathonTraining #TrackAndField #OntarioRunning #OFSAA

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Your watch tells you what you just ran.

PIRX tells you what you’re capable of running.

Most runners grind for years and never find out how fast they really are. They guess. They borrow someone else’s plan. They leave seconds, sometimes minutes, on the table.

PIRX reads the data already on your wrist and turns it into your real potential. Your true capability. A race readiness score before you ever toe the line. No guessing. Just the number your training has earned.

So tell us: what time are you chasing right now? Drop it in the comments and we’ll tell you how close you might be.

Then tag the training partner who swears they’ve peaked. (They haven’t.)

Ready to meet the runner hiding in your data?

Download PIRX at pirx.ca.

#runningcommunity #runnersofinstagram #runhappy #marathontraining #runningmotivation

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We have officially teamed up with @athleticsontario 🤝

PIRX shows you the race time you’re actually capable of running, and exactly what to change to run faster.

Now Athletics Ontario athletes can put it to the test, on the track, road, or trail.

🎟️ 15% off with code AO15 at pirx.ca

What time are you really capable of running? Let’s find out.

#athleticsontario #athletics_ontario_running #athleticsont #pirxapp #runnersofinstagram

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You don’t run because it’s easy. You run because of who you become out there.

5am alarms. Post-run highs. The way a hard week dissolves into footsteps. We’re runners at PIRX, and this is our language too.

Drop a 🏃‍♀️ if today’s run already happened, or tell us where you’re heading. And tag the runner who’d get this without you having to explain it.

#RunnersOfInstagram #TrailRunning #RunningCommunity #WhyIRun #MorningRun

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The “Zone 2” run you did this morning may have been Zone 3.

The formula most watches use (220 minus your age) can be off by up to 20 bpm for individuals. For some people that’s nothing. For others, it’s an entire zone in the wrong place.

Which could mean your easy runs are sneaking into moderate. Your threshold work might not actually be threshold. And the 80/20 split every coach preaches? You could be running closer to 20/80 and wondering why you feel tired without getting faster.

Your real zones probably aren’t a formula. They’re more like a fingerprint, hiding in the deflection points between your heart rate and pace across runs you’ve already logged. PIRX is built to pull them out.

One of our runners found her “Zone 4 intervals” were Zone 3. After adjusting, she took 8 seconds off her 5K.

💬 What watch are you running with, and do you actually trust its zones? Curious what people are seeing.

👇 Tag a runner who lives by their watch zones. They might want to see slide 2.

🔗 Try PIRX free at pirx.ca

#MarathonTraining #Zone2 #Zone2Training #HeartRateTraining #RunningScience

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I used to run to race against the best in the world.

Now I run to find my true self.

The clock doesn’t matter the way it used to. Neither does the finish line. What matters is what shows up in the quiet miles, the version of me I can’t access anywhere else.

Some run to compete.
Some run to escape.
Some run to find out what they’re made of.
Some run because it’s the cheapest therapy they’ve ever found.

There’s no wrong answer. But there is yours.
What’s your why? Drop it below 👇

#whyirun #runningismytherapy #mentalhealthmiles #runtalk #runnersofig

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A recovery score of 82 doesn’t know if you’ll run a 3:42 marathon or a 4:12.

It just knows you’re rested.

Most running apps stop there. PIRX doesn’t.

PIRX reads your training data and builds a projection model. It scores your 5 performance drivers:
- Aerobic Base
- Threshold
- Speed
- Economy
- Consistency
and gives you a projected race time accurate to ±7 seconds.

Then it gives you a Readiness Score from 0 to 100. Built from training load, freshness, recent quality work, sleep, HRV, and week-to-week consistency.

“91/100 — Peak. You’re primed to perform.”

On race morning, you don’t guess. You know.

💬 Comment GUESSING if you’ve ever toed a start line not knowing what you were capable of.

🔁 Send this to the running friend who’s still guessing.

→ Follow @pirx — the only app that tells you your number before the gun.

#marathontraining #runnersofinstagram #runchat #raceday #pirx

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Every mile asks the same question.

Am I getting faster?

Solo miles. Dark mornings. Legs that argue the whole way.
You put in the work, and somewhere out there,
the doubt creeps in.
Is any of this actually adding up?

The miles aren’t the hard part.
The not knowing is.

You deserve an answer. PIRX was built to give you that answer.

What race are you chasing this season?
Drop it below 👇

Save this for your next training block.

→ pirx.ca

#runnersofinstagram #marathontraining #runchat #runningmotivation #marathoner

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After 6 weeks of training, most runners can’t tell you what actually got faster. I can. 🏃‍♀️💨

It’s because I stopped guessing and started using PIRX, a race-time projection app built by Olympians. You connect the wearable you already wear (Garmin, COROS, Apple Watch, Polar, Suunto, WHOOP, Oura), and PIRX tells you exactly which seconds are coming from where.

Five drivers, aerobic base, threshold, speed, economy, consistency, each scored 0–100, updated daily, broken down to the second.

So when I PR, I know what built it. When I plateau, I know what to fix. When my plan needs to adapt, it adapts.

For the first time in my running life, my training has a number. And I can watch it move.

🔗 Try it free for 14 days at pirx.ca
No credit card. No new hardware. Just your number.

#runnersofinstagram #marathontraining #runtok #womenwhorun #pirx

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