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 ...

You don't need to do hundreds of crunches to strengthen your core ... For my standing abs workout, you just need 10 minutes and a pair of dumbbells. A kettlebell is better for the final move ...

Crunches and sit ups are great for working ... When I do this workout in the future, I’ll probably drop my dumbbell weight ...

Crunches are a great way to work your abdominal ... For this workout you'll only need a single dumbbell but if you don't have one, you could use a kettlebell or a heavy water bottle.

After the dumbbell circuit, Janine will take us through three rounds of Russian twists and butterfly crunches. Feeling wobbly? This strength session isn’t about moving fast so concentrate on ...

knee to elbow drive x 20 total Pull over crunch x 15 Lying leg raise with hip raise x 15 Sklar went heavy so I went heavy First things first: Just because Sklar uses heavy dumbbells in the videos ...

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