Everybody knows that a rowing machine can help you get fit and burn a lot of calories if you use it often. Rowing is a lot of fun, but JoergSprave’s Row Boat of Death is quite special. As you can see in the below video, an inexpensive rubber band based rowing machine was used to create this device. Users get to shoot 30mm steel balls as they row. The magazine can hold up to 15 balls.
It’s probably not the most accurate weapon, but you can do some serious damage with it. You may even burn a few calories while trying this.