This 9-minute ab workout uses one piece of equipment to build a stronger, more functional core

Carve out just nine minutes a day, five to six times a week, and watch how your core transforms.
Women's Health

21-15-9 Is Crossfit’s Most Famous Rep Scheme. Here’s Why It Still Dominates Gyms.

We all want simple workouts that deliver results, and that's why the 21-15-9 format has become a staple in high-intensity functional fitness. Originally a CrossFit workout, it involves completing one ...
Women's Health

Build strength fast with 21-15-9 – the rep scheme that makes hard workouts feel more manageable

We all want simple workouts that deliver results, and that's why the 21-15-9 format has become a staple in high-intensity functional fitness. Originally a CrossFit workout, it involves completing one ...