I run and do calisthenics,but many times it simply feels like work. I'd say I enjoy running maybe 70% of the time,but many days it just feels like i'm working. When I do calisthenics or weights, it feels like work 80% of the time. I'd say cycling has caused me to be tired, sore,etc...but it has always felt like fun and not something on my list of chores.Health seems to be a small part of why I cycle. Is fitness your main goal when cycling or is it just one of the benefits?