Here's a great mobility exercise for you to try before your next workout or run. It effectively mobilises the thoracic (middle segment) spine. Try 10 repetitions on each side as part of your warm-up.
Please watch the video above for a good demonstration. The key points to remember are:
Keep your lower back still (like you want it to be when you run)
Allow the elbow to drive the movement, keeping the speed steady and controlled
Ensure the head follows the movement
By Marc Brown