‘Zone Zero’ Cardio Isn’t What It Sounds Like
via lifehacker.com
Short excerpt below. Read at the original source.
We may earn a commission from links on this page. Cardio zones aren’t real—not in the way your fitness app makes them sound, anyway. Yes, heart rate zones are a way to describe how hard you’re working during a cardio workout, like running or cycling. But the cardio zones everyone’s always buzzing about are just […]