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Fun afternoon at Parque Aventura, where despite 30º+ heat, I still managed to beat my best time on the black route by 15 seconds!
in reply to Sarah Brown

The problem I have going faster is it all has to be technique. My poor 49 year old heart won’t actually go any faster. Graph below shows the speedrun ringed where my heart went to 175bpm for 8 minutes and stayed there.

I did feel while I was up there that my muscles simply couldn’t get the power they wanted. Maybe I can go faster in winter when heat dissipation is easier.

in reply to Sarah Brown

Note that although your heart rate is capped, you can still train your blood to hold more oxygen, so you'll get more oxygen to your muscles at the same heart rate. And the good news is you're already training it.