Speed With Guy Martin
4.0 4 xMotorcycle racer Guy Martin sets out to break the record for the world's fastest gravity powered sled.
4.0 10 xGuy Martin is on a mission to do the seemingly impossible - fly using muscle power alone. He wants to build the world's fastest human powered aircraft
4.0 4 xMotorcycle racer Guy Martin recruits a truck racer, an Olympic gold medallist, a bicycle builder and a design engineer to break the British record for bicycle speed - 110mph (170kmph).