You'll use your core to pull your hips up to the sky (it's seriously tough, so give yourself some time to feel it out). To modify, you can step forward and backward in lieu of jumping, or step forward ...

When it comes to working your abs — and, more specifically, your rectus abdominis, which makes up the "superficial core" muscles that give you that six-pack — there are plenty of exercises you can do.

Planks are the MacGyver of bodyweight movements: They’re super tough and great for almost any situation. The versatile move is best known for working your core, but planks also engage more than 20 ...

Move over, Mr. Plank, toning your tum is all about one specific exercise for abdominals. Some were just made to turn your six pack muscles from a dream into a reality. Enter the Swiss ball pike. The ...