Wrap a super-light resistance band loop* around your wrists, and get into modified plank position (elbows under shoulders, legs extended behind you, toes tucked under, back flat), with palms facing up and thumbs out to sides. Drive hips up, toward the ceiling, so your head points downwards and hands move out to sides a couple of inches, forming an upside down V (Downward Dog) with your body, pressing back with heels. Lower hips and move hands back to start. Do 5 reps.
In modified plank position with resistance band looped around your wrists (palms up, thumbs out to sides), keep your head stationary and back flat as you drive hips from left to right, moving opposite hand a couple of inches out to the side with each push. Do 10 total reps (5 each side).
In modified plank position with resistance band looped around your wrists (palms up, thumbs out to sides) and feet about shoulder-width apart, rotate your shoulders and torso to the right, rolling from your toes onto the sides of your feet, in order to bring right hip down toward floor, moving right hand a couple of inches out to the side as you do. Immediately switch sides and repeat. Continue rotating from left to right for 10 total reps (5 each side).
*Start with the lightest resistance band possible. If you don’t have a loop, use a regular band: Grip band with hands about shoulder-width apart (there should be a little tension), thumbs out to sides. Beginners: Perform moves without the band until you become more comfortable, and then add it in.