“You guys are all insane in the best way!” Justin Goldman, a personal trainer and group fitness instructor at Equinox in New York City, hollers at a studio full of sweaty students, one of whom is me.

About a year and a half ago, Sivan Tayer, a 20-year-old college student from Orlando, changed the way she works out. She had thought the best way to get the results she wanted was lifting heavy in the ...

The best workout videos by burn rate: Which YouTube channels are the most effective? Home-based exercise programs are extremely effective in improving both your physical well-being and overall quality ...

Add Yahoo as a preferred source to see more of our stories on Google. “You guys are all insane in the best way!” Justin Goldman, a personal trainer and group fitness instructor at Equinox in New York ...