A form of hiking where you hum the entire way up the mountain. Your friends have to guess the song your humming. It is best learned by spending time with someone who was been hikimg in the past. Bringing along trail mix (with M&M's) is recommended while hikimg. Cashews and almonds are a must.
When hiking just won't cut it, try humming and hiking at the same time. If in doubt, ask Ash, she is a pro at hikimg.