If you don't stay seated... or if you sprint... or if you quit too soon...
https://www.youtube.com/watch?v=ozXvPEp5xW0
Seems dangerous, maybe he should just do a 20 minute test instead...
I do a Ramp Test then 8min then 20min test then ride to John O'Groats where I do a gym session, drink a bottle of whisky and then ride home. It's most refreshing.
@Acliff started
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If you don't stay seated... or if you sprint... or if you quit too soon...
https://www.youtube.com/watch?v=ozXvPEp5xW0