Competing Against The Tendency Towards Inertia

Every so often I think I need a challenge.  A fresh challenge, an undertaking that will force me to confront the things inside me that keep me from learning new stuff (knowledge, knowledge, knowledge), or trying something new.

Except I don't want a new challenge that is just an excuse to do some cliche'd middle-age-misery challenge such as running a marathon or hiking up a mountain. 

No, the sort of challenge that pops up in my head from time-to-time is more of the "Is it too late for me to learn how to bust a move"? or "How much of a chance do I have of learning the bass guitar competently enough to join a surf guitar group?"

Those are just two examples of what I consider a real challenge. If I challenge myself to think about it further, I'm certain I can come up with a few more..