Here is a simple weekly routine to help keep your fitness up.
Tuesday (find a field)
20 minute jog/warm-up; stretch and full drills (as per usual). If ground is good 10 x 80m fast
You need to devise an indoor circuit session (press-ups, sit ups, squat thrusts, burpees etc.) Ideally at least 40 minutes or exercise
Thursday (find that field again)
Same session as Tuesday but add in some hopping and bounding and bunny hops
30 minute run
Try to find a hill or steep incline - 20 minutes jog/warm up - Stretch and warm up drills (as per usual) - 10 x hill reps