HOW: In a standing position, anchor a band underneath the foot of the arm you want to work. You can stagger your feet or have them at about hip/shoulder width apart. For the first press position, rotate your torso to the opposite side, bend the elbow at your side bringing the band up, then press it overhead. The second position involves your torso facing forwards with no rotation. Bring the band up from the side and press it overhead. Lastly, for the third position, rotate your torso towards the hand pressing up, then press it up overhead.
FEEL: You should feel your shoulder and core muscles working
COMPENSATION: Keep your hips facing forwards throughout all three press positions. Only allow your upper half to rotate.