Throughout my ultra-endurance sports career, I pushed my body to extremes that were dangerous and unhealthy; I took my love of running and my passion for Ironman triathlons too far and almost died ...

I blame the pandemic, injuries, and living in a small apartment for the fact that I haven't had a regular cardio routine for the past few years. Recently, though, my excuses have started running out.

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. The Cardio Load ...

The cardio craze has ebbed and flowed for decades. At various points in time, it’s felt like everyone is obsessed with cardio-based workouts—and doing a lot of them—from step aerobics in the ’80s to ...