How do I install a speed bag to a wall with no wooden studs?

I just bought a speed bag and the only place I can put it is in my basement. There are no studs behind the walls, they are just walls made of thin drywall and there are very thin metal columns behind it. How would I install it? This is the model http://store.titleboxing.com/titleboxing-everlast-semi-pro-home-sb-platform.html