A well-designed upper body workout can transform your fitness routine, particularly when incorporating dumbbells for targeted muscle development. This comprehensive 18-minute session focuses on ...

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 ...

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. Your workout routine ...