Sweat. |
Here, in no particular order, are my thoughts on cycling. Sometimes about my job (network guy), sometimes about other stuff. But mostly about cycling and making a 180 a la Mike Magnuson. |
You think heart rate tells the whole story? If I looked at this ride from Friday with HR only, I’d be missing the big picture:

It looks like it was mostly a Tempo ride, but it wasn’t. The stress on my heart may be tempo but the stress to my body wasn’t close. It was Tempo + vo2 + everything else. The momentary spikes of power that wear you out but don’t raise your heart rate fast enough show up with a power meter but don’t with heart rate. Invest in your progression as an athlete, train with power.