hello! tomorrow i have a weird race where i have to run 2 legs of a 5x2km. its more like 2.3km. im coming from a period of sickness than injury and then exams. im not that in shape so i dont really want to run them continuosly. so i wanna do a workout but idk how to structure. i have 2.3k 9 min 2.3k. so what to add in the middle. i run middle dis.