Iliacus or Psoas?

These two muscles are located in the front of the hip joint and I think I have strained one of them. Unfortunately it is at the wrong time with just four weeks left until the Fargo Marathon. I think I was a bit overzealous on Thursday running 10.5 miles at an 8:14 pace. That evening my hip was really annoying me and on Friday I could not even walk without extreme pain. Well the muscle is healing and I managed to get out for a very easy 2 miles today. I could tell I'm not 100% but it has improved a lot. I'll take it easy this week and will probably have to push next weekend's 20 mile run back a week. That should still give me two weeks to taper before the marathon.