is pretty much all you need for some really good training.
A while back I ran across a video on YouTube of a guy who id doing some very interesting work along the lines of "natural" fitness training. I was pretty impressed with him over all and really liked what he did with a piece of nylon strap in particular.
I liked it so much in fact that I made my own the next day.
It's simple to construct. I picked up a 15' long 1 1/2" wide tow strap from Harbor Freight for about $8.00 and removed the hooks from either end (saving them for other kewl outdoor gym stuff) Then I mesured off the length I needed and stitched the hand loops for the strap.
That's all there is to it. Once you're done (about 30 minutes from start to finish) you have an incredibly versatile, highly portable training tool.
I often wrap mine around my waist like a belt and take it with me biking and hiking. When I find someplace interesting I can play to my hearts content.
Along with the strap I have a few other items I use in my backyard training area. The one below is the stick fighters equivalent of a heavy bag.
It consists of a log wrapped in rope with a tire hung under it and an anchor weight to keep the swinging down (but not stop it all together) the contraption is hung from a tree limb then beaten mercilessly. I prefer this to a stack of tires or a tire nailed to a post as it is more lively, and a bit unpredictable. I use this to develop power strikes and for endurance work.
I use a different toy for speed and finesse. I'll post something on that next time