Core-dination
Mostly on the floor, this exercise ties the core to the limbs. Roll down through the spine and walk out to a push-up. Reach the opposite hand and foot around at the exact same time. It is easy to go one, then the other, so aim to match them.
The pace is slow and controlled. The head joins the spine as it rounds, and the legs and arms work together, so the movement feels easier and freer.