I'm out on a small lake in a boat on a summer day and the water's so clear and refreshing looking that I pinch my nose and jump in (woo! so refreshing!). Now I have options. Get back in the boat or swim for shore. It's a nice day for a swim. Which shore? North, South, East or West? Toward the beach at the north shore, the cottage toward the west?
If I really threw myself out of a boat today a) I would freeze to death because it's March 1 in New York State, and b) I would pick a direction because I know I can't stay in the middle of the lake forever.
Now envision this less picturesque but more real-life example:
I'm on the couch in the evening. I could work on any number of fun things I want to do, or I could stay on the couch (not a terrible option - we have premium cable). I've been on the couch. I know the couch. I'm comfortable on the couch. But I'm a little bored on the couch.
So, I'm throwing myself off the couch, into the water, picking a direction and starting to swim.