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My 5th challenge for Challenge639 was to be a successful completion of the TransPyr mountain bike stage race. This crosses Spain across the Pyrennes from Roses to San Sebastian.  

My 4th challenge was to be riding Ireland end to end. This is recognised cycling challenge in the same vein as Lands End to John O'Groates. Typically, sensibly those taking on this route prepare for it by training and researching the route in terms of terrain, prevailing weather conditions etc.  

'There are approximately 639 muscles in the human body. Muscles are one of those things that most of us take completely for granted. In the past I certainly have. The reality is it is impossible for us to do anything without muscles. Absolutely everything we do involves some form of muscular activity.