How can I make up for a very unhealthy lunch?

In honor of trying new things I decided to test out the new fries at Wendy’s that I heard about yesterday on NPR. Of course I couldn’t just get the fries and also got a buger (yes, with cheese). Now after basking in the fast food glory for 20 minutes I am feeling the weight of my choices and my waistline. What can I do today to make up for this poor poor choice?