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Presented by Athleta, this HIIT workout is basically a guaranteed confidence boost. Celebrity trainer Amanda Butler leads you through two different rounds of full-body interval training, helping you ...

The 'blood and guts' guru extends his savage intensity into his cardio work ...

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. High intensity ...

Ready yourself for this full-body 30-minute workout that combines Pilates, HIIT, strength, and cardio for a workout that will keep your body guessing. When it comes to carving out time to work out, ...

From sprints to incline walking, the data shows which workouts burned the most fat – and it's good news for runners ...

Interval training is great for boosting cardiovascular endurance and promoting overall fitness. Our fitness expert, Judd NeSmith, NASM-CPT, PES and founder of Serious Fitness, explains interval ...

If you think endless miles on the treadmill are all you need, science says otherwise. A growing body of research shows that strength training delivers fat-burning benefits cardio alone simply can’t ...

Runners, you've gotta lift. And lifters, sets of 10 do not count as cardio.