boobies and exercise = black eyes for me!! I go with everything strapped in at Zumba!!
Rach, about your knee, I know your not happy about going swimming, but swimming shouldn't harm your knee as much as out of water exercise can. Perhaps as a start you could contact a local pool to find out when they have ladies only session? I started with those sessions, then moved on to lane swimming only, as people there were only interested in swimming and not gawping at my body.
Well done for resisting the chocolates in the house!!