As much as we rely on our feet to get us around every day we sure do abuse them! Cramming them into tight and restrictive shoes, pounding them relentlessly on hard pavement... it's a wonder they don't just get up and walk away!
One thing that most people don't realize is how important the mobility, flexibility and stability of the foot and ankle affect the whole body - especially the knees, hips and back. Having tight or unstable feet put undue stress and strain on all of the joints and connective tissue throughout the whole support "chain". Mobilizing the foot and ankle will oftentimes help relieve knee, hip and back pain as well as improve your mobility in squatting, swings and snatching.
The following video gives some great pointers on some simple things you can do to improve the health of your feet and ankles: