Athlete on Concept2® RowErg®
Coming Soon — Early Access Open

Make the Invisible Visible.
The Home of Concept2® Athletes.

The indoor rowing workout tracker that connects your PM5 via Bluetooth, tracks every stroke in real time, and lets you compete in Backyard Ultra events. Join a global community of indoor rowing, skiing, and cycling athletes — built exclusively for the Concept2® RowErg®, SkiErg® & BikeErg®.

RowErg®
SkiErg®
BikeErg®
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The Concept2® Community

A Global Community of Indoor Athletes.

0K+

New Athletes

Joined in 2025

0M

Meters Logged

In 2025 alone

0+

Countries

In the Logbook

0.0M+

Active Users

Worldwide

Source: Concept2® Year in Review 2025 — concept2.com

“Ultraviolett — the most energetic wavelength of light. Invisible to the human eye, yet carrying the most power.”

Just like your training.

Nobody sees the 5 AM sessions. Nobody counts the millions of meters. Nobody feels the burn in your lungs at the end of an interval session.

But you do. And that's the point.

ErgUltra was built to make the invisible visible. To give every stroke, every watt, every heartbeat a stage. To connect the silent grinders on Concept2® ergometers worldwide and turn solitary training into a shared experience.

Make the Invisible Visible.

Built for Concept2® — RowErg®, SkiErg® & BikeErg®.

Concept2® builds the most trusted, most durable, and most precise indoor training machines on the planet. ErgUltra connects to all three via PM5™ Bluetooth — one app, one community, three world-class ergometers.

RowErg®

The Original. The Icon.

The most widely used indoor rower in the world. Air resistance that adapts to your effort. Built to last a lifetime.

SkiErg®

Total Upper Body Power.

Simulates Nordic skiing — one of the most demanding upper body workouts available. Same PM5™ precision, different beast.

BikeErg®

Cycling. Perfected.

Concept2®'s legendary air resistance technology applied to cycling. Smooth, responsive, and infinitely adjustable.

Concept2® PM5 Performance Monitor — Bluetooth Low Energy
PM5™ Bluetooth Low Energy

Real-Time Performance Data from Your PM5.

ErgUltra connects directly to the PM5™ via Bluetooth Low Energy. No middleware, no delays — pure real-time data streaming. Every watt, every split, every stroke — measured with precision that professional athletes and coaches trust worldwide.

Real-time pace, watts, stroke rate & distance
Workout programming directly on the PM5™
Auto-reconnect with exponential backoff
Multi-Erg support — connect multiple PM5™ monitors simultaneously
No Other Consumer App Does This

Force Curve Analysis — See Your Stroke in Real Time.

The PM5 captures a complete force curve for every single stroke. ErgUltra reads this data in real time via Bluetooth and turns it into actionable technique feedback. No cloud. No delay. Pure local processing.

ErgUltra Force Curve Analysis — Real-time stroke visualization from PM5 Bluetooth data

Real-Time Technique Feedback.

ErgUltra analyzes your force curve in real time and turns raw PM5 data into actionable technique insights — using proprietary algorithms developed in-house. No guesswork, no subjective coaching. Pure data-driven feedback, every stroke.

Our proprietary analysis evaluates your rowing technique across multiple dimensions — providing objective, comparable feedback across all your sessions.

A Closed System. No Cloud Required.

Force curve data is captured from the PM5 via Bluetooth, processed entirely on your device, and never leaves your phone. No internet connection needed. No third-party servers. Your technique data stays yours — always.

Local Processing
Real-Time Analysis
Zero Latency

Community & Competition for Concept2® Athletes.

Every feature — from the workout feed to the leaderboard — is designed to connect athletes, track performance, and make the invisible grind visible to the world.

Activity Feed — BASE

Your home screen. See what your friends are training, give Props, leave comments. Every session on every erg shows up in the feed.

Follow & Connect

Follow athletes worldwide. Build your network across all Concept2® disciplines.

Clubs & Teams

Create or join clubs. Organize team challenges, compare stats, and build community.

Challenges & Leaderboards

Weekly and monthly challenges across all three ergs. Global leaderboards and age-group rankings.

Props & Comments

Celebrate achievements. Give Props for a tough session, comment on personal records.

Progress Sharing

Share milestones automatically. Million-meter badges, personal bests, Ultra finishes.

ErgUltra Social Community — Athletes connecting through indoor rowing

“No one is coming to watch you train at 5 AM. That is the point. But with ErgUltra, your 5 AM session reaches athletes around the world who are doing the exact same thing.”

Make the Invisible Visible.
Athlete in solo ultra endurance training on Concept2® RowErg®
Signature Feature

Last Erg Ultra — Backyard Ultra for Indoor Athletes.

Inspired by the legendary Backyard Ultra format: every hour, you complete a set distance. Miss the cutoff, and you're out. Last athlete standing wins. The first-ever Backyard Ultra format for Concept2® ergometers — live, global, relentless.

Live Global Events
Hourly Cutoffs
Real-Time Leaderboard
Last Erg Standing
ErgUltra Last Erg Ultra — Live SkiErg session with countdown, distance tracking, and real-time metrics

Live Ultra Session — SkiErg Round 1

PM5-Powered Features for Serious Athletes.

From real-time PM5™ tracking to sports-science-grade diagnostics — every feature is designed for athletes who take their training seriously.

PM5™ BLE Connection

Real-time data via Bluetooth Low Energy. Direct connection for maximum precision.

Live Workout Tracking

Every stroke, every split, every watt — tracked in real time during your session.

Workout Rating

Proprietary workout evaluation based on multiple performance dimensions. Fully implemented and live.

Heart Rate Zones

Connect any Bluetooth HR monitor. Live zone tracking during every session.

Performance Diagnostics

Advanced fitness metrics and training insights — all calculated locally from your PM5 and HR data. No cloud required.

Voice Coach

Real-time audio coaching during workouts. Pace guidance, interval cues, motivation.

Challenges & Leaderboards

Weekly and monthly challenges. Global rankings, age groups, device-specific leaderboards.

Training Analytics

Long-term progress tracking. Workload management, recovery insights, performance trends.

Strava & C2 Logbook Sync

Auto-push workouts to Strava. Sync with the official Concept2® Logbook via OAuth.

Offline-First. Always.

TRAIN ANYWHERE. NO WIFI NEEDED.

All calculations happen locally on your device. No cloud dependency. No internet required. No data shared with third parties. Your training data stays on your phone, always.

Local ProcessingAll data on-device
No SubscriptionFree forever
Privacy by DesignZero data collection
Instant AnalysisZero latency

Sports Science in Your Pocket.

PERFORMANCE DIAGNOSTICS ENGINE

ErgUltra transforms your PM5 and heart rate data into sports-science-grade diagnostics — all calculated locally on your device. No lab visit required.

Fitness AssessmentTrack your aerobic capacity over time
Training ZonesPersonalized intensity zones from your data
Workload ManagementBalance training stress and recovery
Recovery InsightsKnow when to push and when to rest

Designed for Athletes. Built for Performance.

A clean, focused interface that puts your training data front and center. No clutter, no distractions — just you and your performance.

ErgUltra Activity Feed — Social workout feed for Concept2® athletes

Activity Feed

ErgUltra Live Workout — Real-time PM5 Bluetooth tracking

Live Workout

ErgUltra Training Plan — Structured indoor rowing workouts

Ultra Training

Strava & Concept2® Logbook Integration.

ErgUltra connects with the tools and platforms you already use — including full Strava integration for athlete authentication and activity sharing.

Powered by Strava

Strava Integration

POWERED BY STRAVA

Log in with your Strava account, and every ErgUltra workout automatically appears in your Strava feed. Your followers see your erg sessions alongside runs, rides, and swims.

Athlete login via Strava OAuth
Auto-push workouts to your Strava feed
Share erg sessions with your Strava followers
Full activity details: distance, pace, heart rate

Train on ErgUltra

RowErg® · SkiErg® · BikeErg®

Auto-Push to Strava

Appears in your feed instantly

Visible to Your Network

Followers · Clubs · Leaderboards

Concept2® Logbook

Auto-sync your workouts to the official C2 logbook via OAuth.

PM5™ Bluetooth

Real-time connection to your Concept2® PM5 performance monitor.

HR Monitors

Polar H10, Garmin HRM and any Bluetooth heart rate monitor.

Wearable Integrations — Coming Soon

Coming Soon

Whoop

Recovery, strain & sleep data synced with your erg sessions.

Coming Soon

Garmin

Connect your Garmin watch for advanced HR and training metrics.

Coming Soon

Polar

Polar Flow integration for heart rate and recovery data.

Strava and the Strava logo are trademarks of Strava, Inc. ErgUltra is an independent application and is not developed by, sponsored by, or affiliated with Strava, Inc.

The Journey to Launch.

We listened, we built, and we're almost there.

Idea & Brand

Done

The vision "Make the Invisible Visible" is born.

Prototype & Technology

Done

Fully functional prototype with stable PM5™ connectivity and 3,000+ automated tests.

Community Validation

Done

26,000+ athletes on Reddit see our vision. #1 post in the world's largest rowing forum.

Strava Integration

Done

Official Strava API integration completed. Seamless activity sync — powered by Strava.

Concept2® Logbook

In Progress

OAuth integration with the Concept2® Logbook API. Sync your training history directly.

Beta Launch — April 2026

Coming Soon

Invite-only beta for Early Access subscribers. Real athletes, real feedback, real training.

Public Launch — May 2026

Coming Soon

App Store & Google Play. ErgUltra goes live for every Concept2 athlete worldwide.

Preparing for Launch

PM5 Hardware Tests — Multi-Device ValidationIn Progress
App Store & Google Play SubmissionIn Progress
Beta Testing & Quality AssuranceIn Progress
Performance & Stability OptimizationIn Progress
"Last Erg Ultra" — The First Live Online EventComing Soon
Concept2® RowErg® training atmosphere — sweat on gym floor

Get Early Access.

Be among the first to experience ErgUltra. Sign up for early access and we'll notify you when the app launches on iOS and Android.

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Partner with Us

Interested in partnering with ErgUltra? We're open to collaborations with gyms, rowing clubs, and fitness brands.

[email protected] →

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