If all points of contact a climber has with the wall are on a straight axis, or close to it, their body may be vulnerable to swinging uncontrollably outward around this axis, like a door on a hinge.
If all points of contact a climber has with the wall are on a straight axis, or close to it, their body may be vulnerable to swinging uncontrollably outward around this axis, like a door on a hinge.