For me, having it all doesn't mean having the corner office at work and a penthouse at home if there aren't kids running around as I'm trying to cook my husband something special.
In high school, my two older brothers ran track. They'd come home sweaty and mud-covered, and I could tell they enjoyed it. So I started running - I ran a mile down the road and back again - and I haven't stopped since.
Often I feel like I can run forever. If someone told me I had to run for 10 hours, I probably could.