Read what happened when our fitness editor did 20 up-down planks a day for two weeks to challenge the muscles in her core ...

The side plank with rotation is a highly effective exercise for targeting the obliques. Begin in a side plank position with ...

Check out these five awesome side exercises to get that chiseled waistline you're after. Side plank variations work those ...

This eight-move routine, developed by a personal trainer, is designed to work all the muscles in your core, boost your ...