Train.Red helps to
IMPROVE YOUR
Muscle Stamina / Aerobic Capacity
Your muscles' ability to endure low-intensity, basic
endurance efforts.
- Real-Time SmO2% Tracking: Monitors oxygen balance to ensure optimal endurance training.
- Live Training Feedback: Alerts when SmO2% drops too low, helping maintain the correct training zone.
- Post-Session Reports: Tracks oxygen utilization trends to measure progress.
Muscle Efficiency / Critical power
Muscle efficiency is the ability to sustain medium-intensity efforts by balancing aerobic and anaerobic energy systems.
- Threshold Detection: Identifies critical power zones in real-time.
- Muscle State Monitoring: Prevents premature fatigue
- Recovery feedback: Start your next interval in Rest Phase I
Muscle POWER / Anaerobic CAPACITY
Muscle power defines the ability to generate short, high-intensity bursts of force, relying on carbohydrates as the primary energy source.
- Real-Time SmO2% Drops: Identifies the transition to anaerobic activity.
- Recovery Monitoring: Ensures full oxygen replenishment between bursts till at least Rest phase II.
In sports, we check how fast we are, how much we do, and how our heart beats, but we forget about our muscles — the part we can train the most!
See how Train.Red can help you improve:
Whether you're a professional athlete, coach, or fitness enthusiast, Train.Red has the tools you need to succeed.
Why Choose Train.Red?
The fastest Muscle Oxygen Sensors on the Market. Experience the next level of training with our smart sensors and easy-to-use app.
⚡ Real-Time Data for 10+ sensors
Real-time insights of muscle performance using up to 22 units at 10 Hz, around the clock.
📊 Fast Setup & easy Insights
No science degree needed—just actionable results
🔬 Advanced Technology
Backed by 20+ years of scientific research of our partner Artinis Medical Systems.
🔗 Seamless Integration & export
Track and sync data effortlessly across devices
Train.Red FYER
Our smartest and smallest Muscle Oxygen Sensor
Auto report feature
Discover a detailed muscle profile following a Train.Red threshold test. Uncover essential training insights for both athlete and trainer
Train.Red PLUS
The fastest and most advanced Muscle Oxygen Sensor
Train.Red APP 2.0
Get yours now on Google Android or Apple iOS
train.red 3rd party
Our system is integration in many other ecosystems. Click here to learn more
Train smarter with Train.Red! Work hard and rest at the right time using real-time insights from your muscles. Endurance is all about using your energy wisely—let your muscles guide you through easy sessions and tough workouts
Build strong muscles with Train.Red’s Muscle States! Whether you want endurance, bigger muscles, or maximum strength, see your muscle’s real-time signals in 5 simple states. Train at the right pace and know exactly when to start your next set!
No matter if you’re training for endurance, bigger muscles, or max strength, Train.Red’s smart rest feature has you covered! Let your muscles tell you when it’s time for the next set!
Test your performance right from the Train.Red app and track progress over time—yours or your clients’! Find your limits, see how training helps, set the right intensity, and plan smarter workouts.
Train smarter with Train.Red! Work hard and rest at the right time using real-time insights from your muscles. Endurance is all about using your energy wisely—let your muscles guide you through easy sessions and tough workouts
Build strong muscles with Train.Red’s Muscle States! Whether you want endurance, bigger muscles, or maximum strength, see your muscle’s real-time signals in 5 simple states. Train at the right pace and know exactly when to start your next set!
No matter if you’re training for endurance, bigger muscles, or max strength, Train.Red’s smart rest feature has you covered! Let your muscles tell you when it’s time for the next set!
Test your performance right from the Train.Red app and track progress over time—yours or your clients’! Find your limits, see how training helps, set the right intensity, and plan smarter workouts.
Over a decade ago, during my PhD at KU Leuven, I discovered NIRS—then bulky, expensive, and limited to altitude studies. Train.Red revolutionized it with simple, reliable, real-time muscle monitoring. Like a portable exercise lab, NIRS surpasses heart rate monitors, enabling non-invasive tracking over weeks. The Train.Red FYER and PLUS sensors are essential for coaches and athletes aiming for peak performance.
Visit WOD_SCIENCE
Over a decade ago, during my PhD at KU Leuven, I discovered NIRS—then bulky, expensive, and limited to altitude studies. Train.Red revolutionized it with simple, reliable, real-time muscle monitoring. Like a portable exercise lab, NIRS surpasses heart rate monitors, enabling non-invasive tracking over weeks. The Train.Red FYER and PLUS sensors are essential for coaches and athletes aiming for peak performance.
Visit WOD_SCIENCE
more EXPERTS IN THE FIELD
Roman Fomin
PhD Director of Sport Science UFC
We (UFC) are taking performance improvement to the next level, using real-time energy systems assessment on both systemic and peripheral levels.
Sarah Thivent
Performance expert
As a performance expert, I needed to measure muscle oxygen saturation (SMO2) during the cycle ergometer tests of my patients. I then discovered Train.Red, I use it every week and it meets my needs very well. It's a simple tool that provides very important information if one is aiming for improvement.
Christian Pirri
Coach & athlete
I use Train Red regularly, on the one hand to make pause control between intervals more efficient but also to control increased SMO2 saturation in the muscle during aerobic training sessions
TRAIN.RED COMPATIBILITY
Want to integrate Train.Red into your already existing routine? We understand!
NEVER STOP LEARNING
our tech
Decades of science resulting in 20 grams of tech, allowing you to measure muscle oxygen.
Courses
"Data will talk to you, if you're willing to listen". Listen and learn how to use muscle oxygen data.
manual
Learn how to use the hardware, the software / app or how sync with 3rd party platforms.
connect your sensor to the train.red app for all features
APP MANUAL
Muscle Oxygen Sensors
FREQUENTLY ASKED QUESTIONS
Do you have some more questions? Check the FAQ, or visit our support page to find out more.
What sensor is best for me?
You can compare our sensors on this page to ensure you make the right choice!
Do you ship internationally?
Yes, we do! We ship from the Netherlands, shipping cost depends on your location. We offer free shipping within Europe*.
For businesses and all other countries, costs are calculated automatically on the website.
How long will it take to get my order?
It depends on where you are. Orders processed here will take a few business days to arrive. Overseas deliveries can take anywhere from 2-14 days. Delivery details will be provided in your confirmation email.
What if the app crash after calibration?
If the app crashes after the 10-second calibration, it may be due to GPS not being enabled on your phone. GPS access is required for the app to function properly.
Solution:
- Ensure GPS is enabled on your phone before starting a session.
- When prompted for location permissions, grant access to the app.
- If the issue persists, manually enable GPS for the Train.Red app in your phone’s settings.
Why can't connect my sensor via Bluetooth?
If you've followed the recommended troubleshooting steps and your sensor still won't connect, check if other Bluetooth devices are interfering with the connection.
One common issue occurs with smartwatches. If a smartwatch is charging, it may automatically keep the sensor connected, even in standby mode, preventing your phone from establishing a connection.
Solution:
- Try disconnecting the charging cable from your smartwatch.
- If the issue persists, enable Airplane Mode on the smartwatch. This will prevent it from interfering with the Bluetooth connection.
- Once the smartwatch is in Airplane Mode, try reconnecting your sensor to the phone.
This should resolve the issue and allow your sensor to connect properly. If you continue to experience problems, please contact our support team.