Watch Moon Climbing athlete David Mason battle with Mortal Immortal (8B+) aka Sean's Roof Sit Start in Blackwell Dale, Peak District.

You’ve just finished climbing the last of the new circuit of boulder problems at your gym… now what? 

Moon Climbing athlete, Michiel shares this useful approach to indoor circuit training that will open up your mastered problems to a whole new method of working your weaknesses to make you stronger!