Try This Move: Thread the Needle
A great dynamic exercise for core and hip strength, as well as mobility
Elbow Plank Thread The Needle
Get into a side plank on your elbow. Feet stacked or staggered.
Tuck your tail bone, squeeze your glutes and engage your core, paying particular attention to lock in the chain from your obliques, down the outside of your leg.
Shoot your opposite hand straight up perpendicular to your body. Slowly start to lower your arm, keeping your hand close to your body, palm facing in towards you.
When your hand is at your chest, begin rotating by moving your hips down towards the ground.
Then let your your core, chest, back, and then arm, hand and head turn. Take a peak over your opposite shoulder.
Then rotate your hips away from the ground in the opposite direction, repeating the steps above to bring your hand back up.
3 sets x 10 reps per side