Keep going. Just keep going. Day and night. Whether it's 10, 40, 75 or 175 hours non stop. Running, mountain biking, kayaking, climbing, swimming. Whilst knowing where you are and where you're going to. Navigation is crucial. Cereal bar after cereal bar. Fighting sleepmonsters. Pursuing your own strategy. Twenty minutes of sleep or 'hanging on' to your team mates to be able to 'sleep on the move'.