Track the front knee over the middle toes of the front foot. (mindbodygreen.com)
The body has been reinforced in key areas and is now much wider just like the chassis itself which gets larger tracks front and rear. (mercedesblog.com)
Overall, we've found the Charge 2 to be quite accurate on the sleep tracking front, with no glaring errors as far as we can tell. (androidauthority.com)