Quote Originally Posted by Scrap
Running up hills wont make you faster, running down them will get you injured. Isometric Stretch with rubber resistance will enable the muscle to prepare for optimum explosivenes and expansion. In preperation for better contraction without injury. Plus running up hills gives bad positional sense for Boxing it puts you on your front foot, a bad muscle memory pattern.
I like the idea of an isometric stretch before a movement. It's a good way to improve speed, and I can see how the elastic bands can help the pre-stretch necessary for explosiveness. Neat stuff.