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Most innovative piece of running technology
With its scientifically backed approach, OnTracx sets a new standard in return to run.
Rehab continues wherever they train, while you gain clear insight into every step between sessions.
Discover how we turn running data into actionable insight.
OnTracx delivers real world running load insights to your workflow.
Traditional rehabilitation

Included in Assess Package

Included in Plan Package

Included in Guide Package


Make progress visible and load decisions less uncertain.
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Understand how much load a runner can tolerate and get recommended load progression, all tailored to the individual.
Use the OnTracx sensor to perform load screenings on treadmill or in the field. Map load at an individual level (Pro package) or leverage general load patterns from our complete sensor dataset.
Create a return-to-run plan that gradually increases cumulative load while aligning with each runner’s tolerance, and easily share it with your athlete via a unique weblink or PDF.
The free athlete app records every session, translates it into load, and sends actionable insights back to your OnTracx platform.
of all injuries are caused by too much biomechanical load
of all runners sustain at least one running injury every year
our own bodyweight needs to be absorbed every step you take
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of all runners relapse within a year after rehab

Returning to run is challenging because rehab may restore strength but not fully prepare tissues for high running loads, which often increase faster than adaptation occurs. OnTracx helps clinicians track and manage mechanical load, supporting a structured, individualized return-to-run and reducing relapse risk.
Exercise therapy and proper load management work together during return-to-run. Therapy rebuilds strength and tissue resilience, while load management guides safe, gradual increases in running stress, helping tissues adapt, reducing relapse risk, and supporting a structured return-to-run.
Running distance or duration doesn’t reflect actual mechanical load, which varies with speed, style, terrain, surface, shoes and more. Recent evidence shows that over 70% of injuries occur when load exceeds the body’s capacity. Volume-based rules like “+10% per week” don’t account for individual load and are often ineffective. OnTracx tracks actual load in real-world runs, enabling gradual, individualized training and long-term injury prevention.
Over 70% of running injuries are linked to excessive mechanical load, often from sudden increases. Fitness can improve faster than tissue adaptation, risking overload. Tracking load helps runners and professionals spot spikes, plan safer progressions, and support return-to-run after injury.
Traditional gait assessments often focus on short observations, which don’t track load progression. OnTracx goes further by combining load screening, training plan generation, and longitudinal load tracking. The focus shifts from describing how someone runs to managing how running load evolves over time.
Many running tools focus on performance, but OnTracx is different: it targets injury prevention and return-to-run. We’re among the first to quantify mechanical load reliably and translate it to runners, with one goal: help reduce the millions of running injuries worldwide.
The tolerance profile shows how well an athlete’s body handles mechanical load. Calculated during intake, it guides a tailored weekly load progression. Low-tolerance athletes get conservative increases, while high-tolerance athletes progress faster, ensuring safer and more effective training and return-to-run plans. More info available in this article.
The OnTracx sensor measures tibial acceleration (PTA) at foot strike using a lightweight IMU. Algorithms convert this into step-by-step mechanical load estimates, letting practitioners track impact and cumulative load. While not direct tissue force, PTA strongly correlates with lab measures of running load.
No, there’s no single “perfect” running style for everyone. Technique changes can reduce load for some runners but increase it for others, so individual measurement is key. OnTracx tracks mechanical load per runner, helping choose the right intervention while supporting overall injury prevention and rehab. Learn more about how OnTracx helps you prevent overuse injuries in this article.
Absolutely not. If an athlete rarely gets injured, they should keep running as usual. Drastic changes in running style or training can backfire. OnTracx isn’t a quick fix, it provides data to help professionals make personalized, informed decisions for gradual training and injury risk management.
OnTracx programs consider load tolerance, screening results, pre-injury training, time off, injury details, practical constraints, and athlete goals. Professionals can fully review and adjust programs, keeping clinical reasoning and shared decision-making at the core. More information can be found in this aticle.
With intervention screening, you can see how any chosen change affects an athlete’s load. The OnTracx sensor measures load and cadence in real time. Record each condition for at least 60 seconds, then compare results to find effective, athlete-specific load management strategies. More info available in this article.
OnTracx lets professionals monitor athletes between sessions. Athletes upload runs, RPE, and pain scores, and the platform visualizes load, adherence, and training progression. Automatic classification highlights who’s “On Tracx” or may need intervention, enabling efficient remote follow-up and program adjustments. More information available in this article.
OnTracx is especially relevant for running-related overuse injuries of the knee and lower leg, such as patellofemoral pain, medial tibial stress syndrome, Achilles tendinopathy, and stress fractures. It doesn’t treat injuries directly but helps clinicians guide safe, progressive return to running. Learn more about how OnTracx helps you prevent overuse injuries in this article.
OnTracx supports consultations without extending them. Clinicians can create a tolerance profile, perform a load screening, and generate an individualized plan in 20–30 minutes. Athletes are then monitored in the field, with the On/Off Tracx system alerting when attention is needed, making follow-up efficient.
OnTracx supports professional decision-making but doesn’t replace it. It gives objective insights on running load and progression, but clinicians and coaches remain responsible for interpreting the data and integrating it with other aspects of rehabilitation such as strength, movement quality, psychological readiness, and overall health.
OnTracx is not a medical device and doesn’t diagnose or treat conditions. It measures biomechanical impact load during running to support professionals and runners in planning and monitoring training. All data interpretation and training or rehab decisions remain the professional’s responsibility.
OnTracx doesn’t directly integrate with other screening platforms, but you can export CSV data for analysis or generate ready-to-use PDF reports. This makes it easy to complement existing workflows or start from scratch with a complete assessment and reporting approach.
With the Lite Package, professionals can start return-to-run programs and monitor athletes using sensor-free load estimates. Adding the sensor provides step-level load data for more precise monitoring and tailored rehabilitation, but hardware isn’t required to use OnTracx effectively.
It depends on the features you want use. Screening or real-time load during running requires a sensor, but OnTracx also supports sensor-free functions. Return-to-run programs can use general load principles, and with Strava integration, load is estimated from prior screenings or historical sensor runs for remote follow-up.
OnTracx is flexible and works across devices. The platform is accessible via desktop, tablet, or mobile browser (preferably Chrome). The OnTracx sensor connects through the mobile app, compatible with iOS and Android smartphones and tablets, supporting both in-practice and field use. See list of compatible mobile devices.
Testing all devices is challenging, and Bluetooth issues can occur. We maintain an updated list of tested devices here. If yours isn’t listed, it may still be compatible, consider reaching out before purchasing OnTracx.
Currently, OnTracx measures mechanical load on one leg for practical reasons. Bilateral load data would be valuable, but for now we recommend placing the sensor on the injured leg during rehabilitation to guide safe return-to-run progression.
Yes, OnTracx can measure load during unidirectional, dynamic movements like jumps and hops. It’s a useful educational tool to show patients how mechanical load works and demonstrate that a single running step often imposes more load than most rehab drills. Read more in this paper.
Yes, athletes can order a sensor via our website using the unique discount code linked to your practice, giving them 10% off. Need your unique discount code or more info about our partnership program? Contact us at info@ontracx.com
Injuries can still occur. While excessive mechanical load is a major factor, many other variables play a role, making exact prediction challenging. Knowing an athlete’s individual load profile helps prevent re-injury and guide rehab, as load should be increased gradually based on objective data.
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