So you think you have what it takes to be a parkour? You will need to work on your body and game all the time. The Pro Ninja Grip Kit can help. It comes with 3-inch solid hardwood balls for rock-climbing strength training. The kit also comes with 2-ft long webbing with steel cam buckles and 8 straps.
These are tested to over 1000lbs. Just make sure you hang them from something that can support your weight.