[jritchie]

as long as one foot is still in the 3 ft "imaginary boundry" they can hop, skip, jump, whatever, but if both feet leave that area you have a violation! and to judge, well i guess you just use experience with it to call it...get an idea of what 3 feet really is and go from there....but remember the 3 feet doesn't count backing up...they can back up as far as they want to, to get away from pressure from the defense