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

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

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 ...

Plus, exactly how to get results from whatever activity you love to do.

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

"Work smarter—not longer." ...

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 ...