Popular actress Jessica Biel is back in the spotlight, this time, though, for her workout routine. Prizing the Norwegian 4×4 ...

All products featured on Self are independently selected by Self editors. However, when you buy something through our retail links, Condé Nast may earn an affiliate commission. Every so often, a new ...

New research shows the 4x4 workout format can improve fitness faster than traditional workouts, such as jogging or cycling ...

What if a short 30-minute workout could not only make you fitter but also add years to your life? Since a high VO2 max has been linked to a longer lifespan, workouts that are particularly effective at ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Like other HIIT-style workouts, the method contains spurts of high-intensity exercise and active recovery ...

Lack of time is often the main reason people don’t exercise regularly. But a type of interval workout recently popularised by ...