I don't want to workout today. I can think of a million reasons why it's ok to not work out. It's a rainy Saturday, and we all need a day to be lazy. My body hurts. I'm too tired. I could go on and on. But I'm going to work out anyways.
Why? Because I have never regretted a work out. What I have regretted, repeatedly, is that one day I skipped, which led to 2 days, then a week, maybe even a month of no work outs. I've also regretted watching progress reverse itself after skipping workouts. I've regretted the steady decline in energy after missing multiple work outs.
Exercise doesn't always have to be high energy, hour long sessions. Get up and go for a walk, or a bike ride. Put on music and dance with the kids. Just get moving. You won't regret it.
In the words of Nike, Just do it!