But also, people who chase those fads and jump from Tae Bo to Jazzercise to boxdance to VR are having fun and exercising the whole time. These people sign up to classes, go, have fun, they get bored with it, sign up again to whatever is new.

Starting new activity is more fun then mastery for many people - you progress faster. And that is actually ok I think.

There is this tendency to turn exercising into chore that tests your moral quality and discipline or what not. But, it is OK to just chase fun.