My daughter climbs hills like a goat on speed... has her own little mantra of "I don't see no stinking hill !" and explains that if there is no hill that riding is easier.
Or she sings while she climbs... when she stops singing I know she is hitting her limits and knows how to take a push from dad when the grade gets evil.
I have a love hate relationship with climbing... going to the dark side and focusing a little anger and aggression triggers a little adrenalin and endorphin boost and sometimes go up cursing like a sailor... when I am not with the girls.