"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." A glute-hamstring developer, commonly known as a GHD machine, is a large, specialized piece of equipment ...

Back extensions, hyperextensions, Roman chair extensions — whatever you want to call them, this back exercise is brilliant at strengthening the muscles along the back of your body, known as the ...

Sana Shirvani trained the cast of the live-action remake of "The Little Mermaid." She shared how she trained Ariel actress Halle Bailey for one week exclusively with Insider. Bailey focused on ...