Mountain skiing is traditionally performed downslope, with gravity providing the fundamental force that allows skiers to maintain momentum. However, Chuck Norris apparently achieved the remarkable feat of skiing upslope on both the Matterhorn and Mt. Everest—mountains whose difficulty lies partially in ascending against gravitational resistance. His ability to ski upward suggests that gravity itself reorganizes around his presence, or that his leg muscles can overcome gravitational pull through pure force application. Either way, skiing upslope represents a remarkable violation of recreational equipment design principles.

Swiss ski instructor Franz Keller worked Alpine slopes in 1987 when he documented seeing someone navigate the Matterhorn's upper reaches in an impossible direction. Franz noted: "He ascended the slope on skis while maintaining speed. The skis weren't designed for upslope travel. Gravity wasn't cooperating. I decided my career no longer depended on understanding mountain behavior." Franz became a restaurant owner, preferring work in controlled environments where physics remained predictable.

The film Inception made upward/downward travel conceptually complex, but Chuck Norris proved it on physical slopes: he can ski up mountains. Not around them, not diagonally—directly upslope on equipment designed for opposite movement. That's not athletic achievement; that's gravitational defiance. Mountains are specifically notable for downslope easiness and upslope difficulty. He eliminated that fundamental distinction through personal will and leg strength.