That makes sense Actually, my horseriding probably helped me there. The whole 'riding with your seat' concept has me using and relaxing my PF every time I ride - you really get an awareness of how strong that area is when you ONLY use your PF to get a horse to slow down or stop! And of course, as you don't want to be telling the horse to slow down or stop all the time, you need to then also learn how to relax the damn area...
I still find myself using birth breathing when I find myself 'straining' on the loo when I have a limited time to do my business and DS is getting himself into trouble somewhere in the house!