Viral 75 Hard fitness challenge promises rapid weight loss through extreme daily rules and mental toughness, but experts warn ...

Rudnik is back at it with his first intense workout since having body work done, and wow he hasn’t sweat this hard in a long ...

If you ask the personal trainer Hilary Hoffman her top tip for gym-goers, it's simple: Stop working yourself to total exhaustion. Hoffman came to this realization while she was working a high-pressure ...

As a former ballerina-in-training, I know breaking the rules can be tough. To this day, I have to fight the urge to win over every fitness instructor — my former ballet master's harsh critiques still ...

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. I first tried the ...

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

Standing exercises for belly fat after 55, with certified personal trainer Michael Betts, 5 core moves that burn calories fast.

Stand with feet together. Shift weight to right leg. Hold a weight in each hand down by sides. Keeping back flat, core engaged, and shoulders down and back, hinge at hips by sending glutes straight ...

"Work smarter—not longer." ...

Chair exercises for leg strength after 65, 6 no-strain moves from certified trainer Michael Betts, with form cues and sets.