I like to push myself with speed, duration, gravity, etc. during a ride. I go into it pretty optimistic and pressure myself to see what I can do. I usually end up not meeting all my expectations, I am pretty drained and sometimes beat up when I am done. After a short recovery, I reflect on the ride and always feel satisfied, relaxed and have memories of a fun time. In other words, my fun factor is dependent on how much I challenge myself regardless of success or failure of the ride.