I too sing, talk to sheep, I bah, they bah, sometimes I bah-bah, not often they reply! I also play some music, have a bit of a dance around, especially when the music momics my walking pattern (Respect by Aretha Franklin is good) I think of good ideas and jot them down, its very hard work hiking! One bloke I know learns and recites poetry! Sometimes I dwell on an up to date topic, think of the questions and the answers to why its crazy to leave the EU for example! Sorry, couldn't resist it! Last but not least I often go over memories of my life, very entertaining at times but often depressing as well.