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From Fellrnr.com, Running tips
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* Like several other devices, the 620 displays [[Firstbeat| Training Effect]], an indicator of how hard or effective a training session is.
* The 620 includes an estimation of the [[Firstbeat| Recovery Time]] before the next workout, just like the Fenix 2.
* The touchscreen works better than any other I've tried while running.
* There is a prediction of your [[VO2max|V̇O<sub>2</sub>max]], which worked well for me, but I would not rely on its accuracy.