I made it out to the gym today and I think I laid the foundation for the Mud Run in more ways than one.
Physically, I did exercises that hit some of the areas where I want and need to gain strength in, namely my upper body. I also did my usual 42-minute cardio session after my exercises.
Mentally, I also focused on the Mud Run, in particular during the cardio session. At several times during my time on the treadmill, I thought to myself 'At this point in the run, I'd be running up to a wall' or the like.
There is still, however, plenty of time between now and the start of the Mud Run and plenty of time to work on different areas of my body and mind.