Mon/Wed/Fri cardio: Go for a brisk 45-minute walk, preferably including up and down terrain.
Tues/Thurs/Sat muscular: Spend 30 minutes climbing up and down the local bleacher stairs (or a nice steep hill). Take regular short rests.
Mon/Wed/Fri cardio: Add short stints of jogging to your walk.
Tues/Thurs/Sat muscular: same 30-minute routine, just cut down on rest time.