Everyone has those days where they just don't feel like working out -- and we all can come up with a list of reasons why we should skip the days workout. Instead of talking yourself out of it, just do something. Even if it's just a walk around the block!
I often times find that once I get moving (even if I just plan on a walk around the block) I end up going much longer than I planned. In fact, sometimes these even end up being my best workouts because I'm motivated from the sense of pride I get from pushing through when I didn't feel like it!