The most obvious lesson from this weekend's Lake Tahoe Crossing by Morgan was that we need to learn by doing. We can sit around and theorize what it would take to swim 22 miles at 6,200 feet elevation, but there's nothing like the real thing, baby.
Can you do an marathon? An Ironman? The Western States 100? Thoeretically, yes. But the difference between junk and art is junk stays in your basement and art goes on display. You have to put the rubber to the road to give an inspiration actual value in society. The Mona Lisa has zero worth if the paint never hit the paper.
So don't just wonder about a goal. Sign up for the event and do it!