Modes of transportation

some "convertible" motorcycles:

1. http://www.huaseen.com/productshow.asp?PicID=266
2. http://www.huaseen.com/productshow.asp?PicID=265

bicycles?

1. http://www.huaseen.com/productshow.asp?PicID=267

running Powerbocking - Stilts - leg extensions - springs

1. PowerBocking isn't for Idiots
2. Clones: http://www.huaseen.com/productshow.asp?PicID=143