Hey Mel
Thats fine as the plan does say to try to get at least oe workout in on a fast. Here is a great dowlnload by one of our nutrition mentors Dr John Berardi as we are following his content.
http://www.precisionnutrition.com/wordpress/wp-content/uploads/2013/08/IntermittentFasting_PDF_r7.pdf
if this doesn’t work then download hos content from
http://www.precisionnutrition.com/intermittent-fasting