Moving from the core ? Lie on your back and place your arms along your torso. tense and relax each part of the arm and keep it solid from the elbow. meaning it nor stiff nor mushy. Just alive with the right amount of nerve activation (You felt this if you ever played with a baby) Now place your feet flat on the ground and lightly bend your knees. Start to sway from your hips to your back on the ground and let the motion proper your arm in circles from the shoulders. Breath and move and enjoy.