i have. my girlfriend was about 142 5' 2'" . probably 21% bf/ she did cardio for 3 months nithing really happened .i convinced her to workout with me ...finnally after months of begging her to lift ,she did. 1 1/2 years later she is doing nationals for figure in 3 weeks . she is shredded and has the 2nd best abs(dexter works out at are gym) in our gym..