This week we will ratchet your training up to 20 total miles with a 5-miler on Sunday.
Today is a day of comparative rest.
Run 3 miles and do some strength training afterwards. Don't forget to stretch also. Today's workout is 3.5 miles, run at an easy pace, similar to last week. Because I said so, that's why. It doesn't really matter what you do on any one day during your training program.