A custom playlist of songs for you synchronize is one way to optimize your exercise routine. Thus it made perfect sense for Spotify and Reebok to cooperate on the Reebok FitList app. To mark this unique partnership. Reebok created a special sneaker box outfitted with sensors, interactive speakers and LED lights. Meant to double as a carrying case for your Reebok sneakers and a boombox, the LED lights glow in sync with the music, surrounding sound, and/or touch. The Reebok FitList App is already available though more information is come on FitList Box's availability.