Lie back on the bench with your legs off the end and grip the bench for stability. Your legs should be fully extended in front of you. Bend at the knees and pull your legs towards your chest as you ...

POP Projects is a collection of new and classic projects from more than a century of Popular Mechanics. Master skills, get tool recommendations, and, most importantly, build something of your very own ...

Sit on the bench with your legs extended in front of you and lean back slightly at a 45 degree angle. from the bench. Flex at the knees and tense your abs to bring your legs up towards your chest.