Rather than read someone like me wittering on about SmO2, here’s a nice infographic from MOXY. Of particular interest half way down is the uses of this kind of product. It really is NOT JUST for working out something equivalent to your lactate threshold.
We’ve all got a bit bored with HR, pace, speed, cadence, bike power. Are we seeing the emergence of new ‘mainstream’ things for us to pore over until the early hours: muscle oxygen, running power, aerodynamic drag?