Climbing legend Peter Croft mentors boulderer Lisa Rands on the finer points of alpine free climbing during an ascent of Venturi Effect in California 's Sierra Nevada .
Venturi Effect is croft 's spectacular route on The Incredible Hulk .
Climbing legend Peter Croft mentors boulderer Lisa Rands on the finer points of alpine free climbing during an ascent of Venturi Effect , Croft 's spectacular route on The Incredible Hulk , in California 's Sierra Nevada .