Do you remember the powered shoe laces from the movie Back to the Future II? Instructables user blakebevin made one and provided instructions on how you can build your own:
Why wait until 2015? Inspired by 'Back to The Future II', this project is less 'Practical' than 'Proof of Concept', but hopefully it'll tide you over until Nike comes out with something more polished. This was also the first time I worked with an Arduino microcontroller, and I wanted to get some experience with the little guy. Operation is quite simple- step into the shoe and a force sensor reads the pressure of your foot and activates two servo motors, which apply tension to the laces, tightening the shoe. A touch switch reverses the servos. Due to budget constraints, I only modified one shoe. Where did I put that darn sports almanac?!
Link via Make