Yup, anything but "thin" or "skinny" and you could be in trouble. "Athletic" is hit or miss, with some pretty chunky girls holding onto their college track & field memories.
I added "No one larger than a dress size 6" to a dating profile, and the hate mail flowed in that size doesn't mean anything, just because I'm big doesn't mean I'm not in good shape, etc. So I rewrote it to "Either be smaller than a dress size 6 OR be able to run a mile in less than 7 minutes." That shut them up.
The internet: inflating fatties' sense of entitlement and self esteem since 1998.