If you did 401 marathons, how do you think it would affect your body, let alone your mind? Ben Smith, a man on a quest to find out what makes him tick in life set out to run 401 marathons in 401 days, an incredible feat of mental and physical toughness. But how did that affect his body? How did it affect his well-being? Why did he decide to do such a mad event? What led to this decision? What did he eat? What was his favourite pair of trainers from the 23 he used? Discover this and much more with this incredible fascinating interview with Ben Smith.  Find out more at: www.the401challenge.co.uk/