It's a long way so why?  Three reasons.  

1. The first is because you are never too old to challenge yourself
2. The second is to inspire those close to me so that they will not shy away from taking up challenges
3. The final reason is to raise money for Bristol Wonderers chosen charity.

Although it could also be known as "Why 56 year old men should remember they are not as young as they used to be!!"