Steve 'Bear' Kinnersley is putting his life on the (zip) line and facing his fear of heights by taking on Velocity 2, the fastest zip wire in the world. Soaring over Penrhyn Quarry he could find himself travelling at speeds of over 100 MPH. He is genuinely terrified and said he will only do this if he can raise a minimum of £500 for GRIT, a Hitchin based charity he works with, teaching non-contact boxing to help reduce self-destructive behaviour in teenagers.