VO2 max is the maximum volume of oxygen you can absorb per minute per kilogram of body weight at your peak, and almost every Garmin watch ... watch or paired chest strap Heart rate data must ...

There are a few reasons for this. Lets start with the strap. It's much nicer than the silicone straps that come on the Apple alternative. The Garmin strap is much thinner, making it more pliable.

This naturally uses more battery power ... 3’s moulded strap and surprisingly low weight helps here. Last-gen hardware does absolutely rule out the watch ever getting Garmin’s ECG heart ...