The Carving Trike is a cambering vehicle. It's designed with a 100 year old concept. It moves forward when you shift your body weight from one side to the other, similar to roller skating or skiing. It's a fun activity for all ages and it's a great non-impact exercise.

Unscooter is a three-wheel action scooter. To accelerate the rider makes  scissor-style action -- pivot both feet all the way out then all the way back in.