Instead , he trains on a treadwall ( picture a wide , vertical treadmill with climbing holds ) and boulders indoor and outdoor for variety .
He won this year 's rope climbing nationals at a climbing gym in Boulder , but he does n't train with a rope .
He trains on a treadwall ( picture a wide , vertical treadmill with climbing holds ) and boulders indoor and outdoor for variety .
He won this year 's rope climbing nationals at a climbing gym in Boulder , but he does n't train with a rope .