The world's first wearable lactate threshold sensor. Accurate training zones Test every 4-6 weeks. Training zones change as you progress through your endurance training. BSXinsight is the only option to give you accurate zones based on your current biosignals without having to repeatedly go to a sports science lab and retest. Custom training plans Custom training plans based on your biosignals and backed by one of the leading coaches in the endurance world. Get data that verifies your progress Stop trying to “feel” whether you’re pushing too hard or leaving too much on the road, and stick with the science. Industry experts predict performace increases of up to 25% with BSXinsight, proving that there’s never been a more powerful way to train. One easy sleeve for comfort The durable compression sleeve secures BSXinsight to a single location on your calf. This allows BSXinsight to measure consistent data points to ensure accurate results. Devices come with a sleeve, and we have a size chart to help you choose your fit. Cycling: Cyclists depend on energy to power their sport. BSXinsight optimizes cycling power output, recovery, and readiness by monitoring your muscles’ effort in real time. Running: Improving running efficiency and optimizing effort is key when training for that next race. BSXinsight monitors your body's performance so you get the most out of every mile. Multisport: Multisport athletes rely on a variety of metrics to optimize their training. BSXinsight monitors your body's critical energy systems to provide a complete training profile.