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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 ...

Discover how just four minutes of supramaximal interval training can trigger powerful cardiovascular, metabolic, and ...

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 ...

High-intensity interval training is a workout technique that gets you a lot of bang for your buck. This type of workout serves as cardio and strength training, burning calories, boosting your ...

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 ...

Which cardio burns the most fat? From jogging and sprints to incline walking and swimming, here’s what a metabolic-mask experiment revealed – and what actually matters for long-term fat loss.

After years of doing cardio and HIIT classes, I'm trying to incorporate more strength training into my fitness regime as I want to build some muscle (and have next to none). My question is: If I carry ...