Nicole Scherzinger shared an intense workout clip on Instagram, admitting she almost quit “halfway through” before pushing to ...

Experts discuss the small but promising study.

The 'Buffy the Vampire Slayer' star brought fans along for a busy day in her life.

Plus, the surprising benefits of turning the intensity down a notch.

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. Sprint interval ...

Exercise is known to benefit heart health. High-intensity interval training (HIIT) that combines aerobic exercise with ...

Boost your endurance and strength, all at once.

For your speed workout, try a fartlek run/walk: After a walking or easy running warmup, run hard for 30 seconds or as long as ...