Big Fish Extra Catch: How I'm preparing for my toughest challenge yet Big Fish with Spencer Matthews

What is the secret to endurance training? I've completed multiple extreme challenges - most recently an ultra marathon in the Amazon jungle and another in the Sahara, Marathon des Sables. In this episode with Shaun Stafford are giving you the lowdown on how I train for such events and how I keep focussed. I'll also reveal how I'm currently training for my toughest challenge to date.