Everything you need to know about:4x4x48 Challenge
With this upcoming weekend being 4x4x48 weekend, where people worldwide take part in David Goggins' 4 miles every 4 hours for 48 hours challenge, Seán and Eric look back on Seán's approach to the Challenge last year.
We look at the preparation, training, nutrition and what they would change if they were to do the event again.
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If you've never had your VO₂ max or metabolism measured, there's a…
The skinny
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