Lactate gets cleared by good lungs and good blood flow. Knowing when it get to our threshold for overwhelming our muscles is a thing. Being able to monitor it more directly than just HR data will be a game changer for all of us. But for most of us not until the cost is low enough for use as a additional sensor to a Garmin or other device.

Perhaps there are some out there, but the IDRO website didn't seem like this was in a commercial marketing phase yet. IMO, potentially, lactate information will be better and more useful information than what a PM provide.