It's easy to forget how important it is to truly challenge your core during a workout. Those crunches, scissor kicks, and hollow holds you've been doing might feel challenging, but in order to get ...

Core-focused exercises for lower abs including crunches, planks, and twists.

If you're looking for a versatile way to build strength, train every single muscle group - in isolation or through compound movements - free weight exercises are the answer. Whether you're at home or ...

Using free weights can significantly improve muscle strength, endurance and overall fitness by building lean muscle mass, burning calories and improving bone density, according to White. “Additionally ...

Add Yahoo as a preferred source to see more of our stories on Google. While I enjoy using both free weights and exercise machines like the leg press, I have to say I often prefer the simplicity of ...

Core training has always been part of military PT and fitness testing. From crunches to sit-ups, flutter kicks, leg tucks and plank poses, the U.S. military uses many exercises to test core strength.

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. Starting an exercise ...