In an effort to enhance his workout, Lior Elazary designed an Arduino enhanced punching bag. The bag is outfitted with sensors made from aluminum foil and conductive foam, which are interfaced with the Arduino analog inputs via resistors. Bright LEDs are implanted in the bag near the sensors, and the Arduino flashes the LEDs in a programmed sequence. The user must strike the bag sequentially in the areas corresponding to the LED pattern.
The source code is provided, however since it was written using a makefile and vi editor you would need to make changes in order to use it with the Arduino IDE.