Switching from a high intensity interval to a a very focused, controlled movement is a great challenge. Planks will always be more difficult after a good burst of cardio. Similarly, it always feels great to burst into some quick cardio after holding a plank.

Adding a simple reach to your plank will the core’s ‘ribbon’ even more. Your core muscles wrap around your torso like a ribbon, so working opposing sides is a super effective way to strengthen through the whole core.