answer:Slacklining. My son got me up on the damned thing a few weeks ago, My leg oscillated like a thing possessed, just as he’d told me it would. The few times I actually let go of his shoulder (he was walking alongside me), I was quickly catapulted off to the side. My son assured me that after a couple of dozen tries, my brain would figure out how to dampen the oscillations, and I have no reason to doubt that. But weighed against the prospect of 3 weeks in a cast, it just didn’t seem worth it. I’m playing the age card more and more often these days.