What if one of the strongest predictors of longevity wasn’t your weight… …but your VO₂ max? VO₂ max measures how efficiently your body uses oxygen during exercise — and it gives us insight into how well your heart, lungs, blood vessels, and muscles are working together. And here’s the good news: You don’t have to train like an athlete to improve it. One of the best places to start is with Zone 2 cardio. Zone 2 is that steady, sustainable pace where you’re working, breathing i