Ruth Field is the author of RUN FAT B!TCH RUN and THE RUN FAT B!TCH RUN MARATHON PLAN. She is a former criminal barrister and lives in North London with her husband and twin sons. She blogs regularly at http://gritdoctor.wordpress.com/ and you can also find her on Twitter (@gritdoctor) and Facebook (www.facebook.com/thegritdoctor).