Glad the link helps, general (including SW) BMI charts put me down to as low as 7 13, impossible, I tried, 8 6 was the lowest. Using that chart I'm a medium frame, so my target of 8 8 is spot on. My OH would be around 8 2 at the lowest, just not ever going to happen, a target of between 9 11 and 10 1 makes it much more acheivable with her larger frame.