Setup and Key Actions
From plank bend knees slightly, shooting the hips back and up, keeping the spine long and knees soft. Press your hands into the ground as if you are pushing it away from yourself. visualize your body in the shape of a pyramid.
Modifications
For beginners, keep the knees slightly or deeply (if the back of your legs are super tight) so you can find your long spine first, once you get comfortable there, start to slightly straighten the legs pressing the heels towards the earth.