Cardio

I want a simple device that tells me how far I've run, what should I get?

A girlfriend.

Most phones have this. But if you want more accurate get a used basic Garmin Forerunner 10.

Do it OP.

A track.

I use my fit bit blaze, have to have your phone with you tho.

Google maps

God I fucking want to see some autistic fucker use this.

Kek

Garmin Forerunner 25 is a solid choice