Say goodbye to basic crunches and hello to three muscle-torching crunch variations to build core strength. For this workout, you just need one of the best yoga mats and a resistance band or loop ...

They're all shredded. Big names like Vitaly Scherbo, Simone Biles, and Alexei Nemov are known not only for their skill level, ...

Of all the abdominal exercises, the basic crunch is one of the most effective. The key is to keep the movement slow and to focus on good technique. Lie on your back with your knees bent ...