Dan, as I've already said to make this work you will need to create a new profile question type.
If you are not familiar with the code modifications, you can apply to a developer who can help you with this at Oxwall Market:
http://www.oxwall.org/market/specialists).
Either we can suggest to create the Height/Weight profile questions with the predefined range. For example:
Height profile question with the following values:
32">4'7" (140cm) or below
64">4'8"-4'11" (141-150cm)
128">5'0"-5'3" (151-160cm)
256">5'4"-5'7" (161-170cm)
512">5'8"-5'11" (171-180cm)
1024">6'0"-6'3" (181-190cm)
2048">6'4" (191cm) or above