Ran my first 5K!

Since Tough Mudder is a 13 mile course, with lots of running between each obstacle, I figured I better get my endurance in order. I started the Couch to 5K program on the treadmill. I got 4 weeks into the program and on the first day of week 5 I was in a really bad mood. I was ANGRY! I started running as the APP told me to, but when it told me to walk, I didn't want to. I just kept running until I ran 5K! I ran it on the treadmill in 30 minutes. Everyone says switching to pavement is a lot harder.... you will be using muscles you don't need to use on the treadmill. I ran my first real 5K on April 20th. Yes it was harder... I had to stop and walk out a cramp in mile 2... when I was coming around the corner to the finish line, I expected the clock to say 40 minutes... but it said 28 minutes!! I finished the race in 28 minutes and 56 seconds.... and as for using the muscles you don't use on the treadmill? Oh yes that is true... I felt like I had been hit by a bus for the next few days lol. I have 2 more 5K races in the next two weeks and I am excited to see how I will do.