How to do it: Get on all fours with your hands under your shoulders—holding light dumbbells—and your knees under your hips.

Perform each move for 50 seconds, taking just 10 seconds of rest between each one. Complete all the moves, and then you're ...

Instead, try this six-move workout to build a stronger core, without a crunch, situp ... For this workout you'll only need a single dumbbell but if you don't have one, you could use a kettlebell ...

By day four, I was feeling it. Laughing, bending down, and just getting into position for the workout had my abs reminding me of every rep. By the seventh day, my core wanted a day off, and I had ...

If you have 10 minutes to spare and a couple of dumbbells to hand ... switching to the lighter one for the side plank and standing crunch. The variety of moves in the workout ensures that you ...