Trial name or title	Physical activity as an aid to smoking cessation during pregnancy (LEAP) trial
Methods	Individually randomised controlled trial.
Participants	Pregnant women who smoke at least 1 cigarette a day (and at least 5 cigarettes a day before pregnancy), and are between 10 and 24 weeks pregnant
Interventions	Supervised exercise on a treadmill plus physical activity consultations
Outcomes	Self-reported and biochemically validated continuous abstinence from smoking between a specified quit date and the end of pregnancy
Starting date	The LEAP trial began recruiting patients in April 2009, and recruitment will close in November 2012 Data collection for the primary outcome is due to be completed in July 2013. As of October 2nd 2012, 768 women were recruited
Contact information	Michael Ussher: mussher@sgul.ac.uk Division of Population Health Sciences and Education, St George’s University of London, Cranmer Terrace, London SW17 ORE, UK
Notes	ISRCTN48600346