Your watch’s VO2 max isn’t perfect, but you can improve its accuracy with better data and heart-rate tracking.

While they're not always perfect, health trackers like the Oura Ring can detect early signs of illness. Don't ignore them.

We tested popular wideband O₂ controllers against lab-grade equipment to see how accurate their lambda readings really are ...

VO2 max is an intimidating word for an easy-to-understand biometric: It’s how well your body uses oxygen when you push yourself. Short for “maximal oxygen uptake,” it’s been the gold standard for ...

O2 customers are being urged to scrutinise their recent bills after Martin Lewis warned they could have been unfairly stung with hundreds of pounds in charges. The dispute erupted when O2 announced it ...

As if England’s second shellacking in two Ashes Tests against Australia wasn’t bad enough, stand-in skipper Steve Smith’s spicy sledge of paceman Jofra Archer only rubbed salt into the wounds. As the ...

Martin Lewis has advised anyone with a mobile phone to input their address into a website to instantly determine if their provider offers the best signal. Those using EE, Vodafone, Three, O2, and ...

Martin Lewis has told anyone with a mobile phone to put their address into a website - which will instantly tell them if their provider is the best signal. Anyone with EE, Vodafone, Three, O2 ...