Getting ready for the SC Mud Run - fall edition

For some reason, my cardio preparation has been a bit lacking for the SC Mud Run next week:

I have run only three times since the Camp Pendleton Mud Run in June and my pace since then is definitely much slower (from a 9:52/mile pace last June to a 10:43/mile pace now).  Granted, the SC Mud Run isn't nearly as running-oriented as the Camp Pendleton one.  And since it's very obstacle-oriented, I've been focusing on tackling and preparing more for the obstacles I remember lacking at the last SC Mud Run--specifically getting over walls and transferring ropes.  Fingers crossed!