I'll play it by ear. My wife ran it last year and did 10 laps (we were going to run as a mixed pair and aim for 10 each but I got in a car accident so she went solo). I think she would like to top that this year and I will cling on for dear life to keep up
I had something similar when I started running. I got stronger and it stopped. I would try some strength work along with the running. I think the body has to go through a lot of adjustment if it is not use to moving.