Dirt Bike Fitness Odyssey: Sleep tracking, Sticker Sensors & Fitbit
Ya gotta rest well to improve your performance, so something like the Zeo Sleep Manager device might be an interesting addition to the arsenal of fitness monitoring tools.

I’ve ordered one, though it’s primarily for my wife, since she has problems sleeping. I’ll report on how it works once it arrives.
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Here’s another interesting sensor concept: Stickers as Sensors

Being tied to an ethernet-wired base station might be a bit limiting, since you can’t take the GreenGoose system/sensors out on the trails, but might still have some interesting possibilities. An automated reminder that you’re overdue for a ride on the trails, perhaps?
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And then there is the Fitbit Ultra sensor.

Unlike the GreenGoose stickers/sensors, which need to be within a few hundred feet of a base station, the Fitbit Ultra will store the data and then upload it automagically when it gets into range of it’s base station, making it something that would work out on the trails.
The built-in accelerometer and altitude sensors are intriguing. Makes me wonder if you could create an offroad riding specific app that monitors bike movement and the like, using the Fitbit API, to track interesting ride measurements.
Interesting times!