Voice control so I can start and stop the clock without taking my hands from the bars. Alternately, a wireless thumb mounted button I can easily press in the middle of an effort. Somehow making something I can control while in full sprint that has better than the 1sec resolution given by Strava.
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Cat 2 Track, Cat 3 Road.
"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --
the tiniest sprinter