What ever you set your mind to run is what you will be able to do, as long as you have been training. A 4 miler can be as hard as a 6 or a 10 because it is what you set your mind to do. That is why they say so much of running long distance is a mental game. This last Saturday I had made my mind up to run from my house to the GHS Pancake Run which was a 10K and then run back home. It was 3 miles to the Riparian Preserve which is where the race was at. It was a fun course. I had planned on running a total of 12 but after doing the 10K I felt pretty good so I decided to add 2 more miles to make it a total of 14. It helped me to feel prepared to run Ragnar in 2 weeks. I will be running a total of 16 miles for the relay. Last year I ended up with a stress fracture in my foot after doing Ragnar. I felt like I hadn't trained enough for it. I had to run an extra leg last year because one of our runners got sick at the last minute, so I ran a total of 19 miles. I had only trained up to 10 or 12. Even though the runs are broken up it is still a lot of miles pounding on your body in a 24 hour period. Gilbert is a great place to run.