Another wearable lactate and movement sensor here: http://www.bicycling.com/training-nutrition/training-fitness/can-you-biohack-your-way-peak-performance
Cheap too
Got a way to go... https://www.indiegogo.com/projects/echo-h2-hydration-lactic-acid-and-glucose-sensor
@hippy started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Another wearable lactate and movement sensor here: http://www.bicycling.com/training-nutrition/training-fitness/can-you-biohack-your-way-peak-performance
Cheap too