What should you're workout be for today?

Today, if you didn't do the marathon, you should go for a 6 mile run. Every week you should increase your milage by 1. It'll help keep your endurance high and will make your races feel like a breeze. If you did the marathon, you can go for a 20 min run. Yes it sounds like a little compared to 6 miles, but your body needs to take it easy. It's important to let it rest and over work it.