POLAR VANTAGE V2

£449, polar.com

The Polar Vantage V2 GPS multisport tracker offers a training readiness double-whammy. You can choose between a chest-strap ECG orthostatic test that measures daily HRV, or a Nightly Recharge score that uses the optical heart rate sensor to assess how well you bounce back from the day’s stresses each night. Unlike some trackers that run in the background, the orthostatic test involves lying still and standing for a short period. Once you’ve built your baseline, the V2 feeds any major deviations into your Recovery Pro recommendations and tells you if your cardio system is recovered or not. There are handy test reminders and this is closer to what you’d get being tested by experts.