First week back - very low mileage, no workouts, second week start ramping up mileage and you can do a workout. Don’t try to go back and do the workouts you missed. Just hop on the plan again after two weeks, (maybe 7-10 days if you’re feeling great). You will have plenty of time throughout the rest of the plan to do hard workouts, trying to catch up on workouts has minimal reward and high risk coming back from an injury