01
Attach ReFlex
Place the sensor on the target muscle before your set. ReFlex begins capturing muscle activation signals in real time as you train.
The Future of Muscle Performance
Realtime insight into muscle activation and fatigue during every set.
HOW IT WORKS
Built for strength training.
ReFlex fits seamlessly into your existing workout, turning muscle activity into clear performance insights during every set.
02
Train Normally
Perform your exercise as usual. ReFlex automatically detects reps and tracks activation and fatigue throughout the set.
03
Get Results
After the set, activation and fatigue are summarized into clear performance scores so you can see how the muscle actually performed.
REALTIME FEEDBACK
Understand every rep.
In Realtime.
Automatic Rep Detection
ReFlex detects each repetition in realtime, eliminating the need for manual logging. Your workout is captured automatically, allowing you to focus entirely on execution.
Rep Level Activation
Monitor how muscle activation changes across every repetition. See how engagement evolves through the set and how performance shifts as fatigue accumulates.
Time Under Tension
See how long each repetition remains actively engaged. ReFlex tracks rep duration and reveals how tension builds and changes throughout the set.
PERFORMANCE ANALYSIS
Talk to your muscles.
Literally.
ReFlex translates activation and fatigue patterns into clear, actionable insight so you can understand how each session is shaping your performance.
PERFORMANCE TRENDS
Spot trends.
Break plateaus.
See how activation and fatigue change over time, so you can spot what’s working, what’s stalling, and what to adjust next.
What is ReFlex?
ReFlex is a wearable device that measures muscle activation and fatigue during strength training. By analyzing electrical signals produced by your muscles, ReFlex provides real-time feedback and performance insights for every set.
How does ReFlex measure muscle activity?
ReFlex uses surface electromyography (sEMG) to detect the electrical signals produced when muscle fibers contract. These signals are processed to estimate activation levels and fatigue patterns during exercise.
Do I need to change how I train to use ReFlex?
No. ReFlex is designed to fit seamlessly into your existing workouts.
Place the sensor on the target muscle, perform your exercise as usual, and the system automatically tracks your performance during each set.
What exercises can I use ReFlex with?
ReFlex works with most resistance training exercises including free weights, machines, and bodyweight movements. As long as the target muscle can be monitored with the sensor, the exercise can be tracked.
What metrics does ReFlex provide?
ReFlex tracks several performance metrics including: muscle activation per rep, time under tension, set-level activation and fatigue scores.
These metrics help you understand how a muscle performed during each set.
Do I need to use my phone during my workout?
ReFlex connects to the mobile app, which records and displays your workout data. You can review metrics during or after your sets depending on how you prefer to train.
Can I track multiple muscles?
At the moment, ReFlex is designed to monitor one muscle at a time. You can easily move the sensor between muscle groups during your workout. Simultaneous multi-device support is planned for a future release.
How accurate is the data?
ReFlex is based on established EMG measurement techniques used in sports science and research. While it is designed for training insights rather than clinical diagnostics, it provides meaningful information about how your muscles are working during exercise.