If you're "trainingโ for a cycling or triathlon competition, you've probably already read all about cadence and what it means. While not exactly the same as "exertion," the cadence readout can be very helpful if you don't want to waste money on your power meter. Step forward GSC10. on a chain with a pair of ties. Then there is a magnet that attaches to your spokes and another that attaches to the pedal. The GSC10 then sits in the middle and measures those two magnets and sends speed and cadence readings to your Garmin. While it can be a bit awkward at first to 'align' the device with both magnets, this actually helps you to a certain extent as it will flash 'green' when it successfully registers the passage of the magnet. YouTube is a great resource. Once it's installed, you don't need to mess around with it anymore. I have 2 and only had to replace 1 battery. I find cadence measurements very helpful. Speed readings are only really useful if you train indoors, otherwise your GPS speed readings will take precedence. I like this device. I'm just unchecking the box to let you know that Garmin is releasing two new units - one for speed and one for cadence. This block remains cheaper, but if you want to check out the new ones,
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