To make it easy, we asked 12 different Pilates instructors for their top ab moves; incorporate a few of these 11 exercises into your next core workout for a slow and steady burn that'll strengthen ...

With 7.6 million views on YouTube and the claim it’s the hardest abs workout ever in the title, I had to give this 9-minute workout a go, and it was a stern challenge for my core.

You may like Forget crunches — this personal trainer’s 7-move dumbbell workout builds core strength and improves posture; Forget sit-ups — it only takes 15 minutes and 1 dumbbell to build a ...