Stand with your feet hip-width apart. Pull your core in toward your spine, and keep your chest lifted.
Stretch your arms out to the sides at chest level, opening them up as wide as you can.
Wrap your arms all the way around your chest, right arm on top and left arm on bottom, crossing them like you're hugging yourself. Tap your shoulders or back with your opposite hand.
Stretch your arms back out wide, then hug yourself again. Switch arms this time, putting your left arm on top and right arm on bottom.
This counts as one rep. Continue at a steady pace for two sets of 10 reps, resting for 30 seconds between rounds.