Jungle Gym / Monkey Bar Gym / Suspension Trainer

There is an interesting tool for body weight training called a "jungle gym" or "monkey gym" or "supension trainer".

Ready made products are availlable from
TRX (expensive, better quality) or it's reseller in Germany http://www.transatlantic-fitness.com/
Or
Monkey Bar Gym (less expensive)
You mind find this review of the both useful if you have to choose one.

There also is a german alternative looking as if being high quality product.
http://www.aerosling.de/

Newest kid on the block: http://gtxsuspensiongym.com (not availlable yet)

I you don't know that to do with it, have a look at this amazing Youtube video.
Also notice the exceptional Power Wheel featered!