So i stupidly signed up to the 5k pretty muddy event in july.
I am a BIG girl! size 22 up top and 18 bottom. The boobs are an issue!
i can run 5k but im just so slow 
My colleagues are just started training and they are doing it in about 30-35 mins and one girl is 27 minutes !! she is like a gazelle though.
There's me gallumphing along like an elephant at 45 minutes
I don't stop and tun the whole thing. I Am a bit older in my 40s where they are late 20s early 30s but i am going to humiliate myself.
How can i get my speed up? or should i just accept that im too fat/old for this shit.