Longevity for dirt bike riders

[swazi_matt]

Some nice pointers here. I guess I knew that cardio would come into it!

The one thing I have often thought about is arthritis, especially in the hands. Anyone know if this is one of the perks of DB riding? What can be done to prevent it?
I remember seeing a hand exerciser that worked in the opposite way to a stress ball, it worked the muscles used to open your hand and apparently this balances the muscles in your hand ... or would an injection of snake oil do the job just as well???