Even if you're physically fit, walking up steep slopes is tough work. Take Alpkopfbahn and get up the mountain quickly and comfortably. The views are better too!
When you've spent some time at this incline railway in Serfaus, why not check out Serfaus-Fiss-Ladis, Fendels-Ried Gondola, and Summer Funpark Fiss? They're close to Alpkopfbahn and also popular with tourists.