Every new year comes with big intentions — and the quiet fear that I'll end up doing exactly what I did last year.

Workout challenges are incredibly common, but this one definitely takes things a little far. Three noted strongmen documented their grueling cardio workout, which ended in a repulsive competition: The ...

Orangetheory Fitess Canada workouts are structured to combine interval-based cardio with full-body strength training.

Add Yahoo as a preferred source to see more of our stories on Google. Considering a new fitness challenge? Experts say there are benefits — but it's not for everyone. (Getty Creative) If you’re not a ...

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. Sweat isn’t an ...