i wouldnt bother hun, if ur going to tear, ur going to tear.
i did pelvic floor excersizes religiously with both the girls.
DD1 i birthed flat on my back (notorious for horrible tears) followed my bodies lead as per midwifes instructions and didnt even have a paper cut!
DD2, although she was posterior and a tear was unavoidable, i stupidly listened to the mids when they TOLD me to push instead of letting my body tell me, i was very out of sorts and incredibly scared and just wanted her out. 2nd degree tear in 3 different directions.

in other words, listen to ur body, push when it tells u to, dont be forced into pusing when ur body doesnt want u to

much love hun, not long now xxx