Every few months, a new treadmill routine blows up online.
First it was 12-3-30, now it’s 6-6-6 and Zone 2 cardio. Same reason every time: low friction, camera-friendly, and easy to measure.12-3-30, now it’s 6-6-6 and Zone 2 cardio. Same reason every time: low friction, camera-friendly, and easy to ...