Ok, after a bizarro body fat percentage calculation at 24hour fitness today, I was told 118 pounds was my "ideal weight" IF I want to have the abs I want. Now, at 5'9 136 lbs my abs aren't TERRIBLE, and at 6'0 182 lbs my boyfriend's abs are decent as well (they suggested he lose 15 pounds). What's the deal? How much should I actually weigh? And I don't want to base this on BMI, but aesthetics instead.

http://s246.photobucket.com/albums/gg94/kristiecsu00/