motivational black hole

I'm not having any trouble filling up all this free time I have. I am having a hard time filling it up with "productive" things. I use the term productive loosely because that's not really what I mean. I haven't exercised in almost two weeks. What?! I like exercise and I feel better (and sleep better) when I do it. But for some reason I can't make myself go do it...apparently I'd rather spend hours on my computer discovering new and useless things on the internet.