Susan,
18 points is exactly where I always am. At 4'10" and in the 120's. (And yes, I still need/could lose soem weight).
About 5 years ago when I did WW first time I lost from about 140 down to where I am. I started cycling then too. But I never reached goal. (no, 120 is not thin!). I have tried over and over to get back on WW--and sustain running/biking. But can't. True...I LOVE to eat and eat out and drink adn partly it is discipline. But 18 points is almost impossible for me to do and that is why I can't seem to stay there. When I did WW the first time...I really "added" activity points EXCEPT weekends with long biking days.
I have yet to find the answer. But I know that 18 points does not work for me...I can't seem to stay there and feel satisfied nor have teh energy to do what I need to do. I usually found about 23 points worked...I felt "ok" at about this level. So maybe that is waht I need to try. Not low like it says, but at a reasonable level.
K