I'm 71 and 7+ months out from NS RARP. I'm continent so I'm only doing 2 sets a day for maintenance, although I used to do about 4 sets a day. I do a 10 count of 10 second holds with 10 second rests, followed by a 10 count of 1 second quick holds and releases. It takes me 4 minutes to do the routine. I don't know if I need to keep doing them since I'm continent, but they take so little time and since I'm continent I'm reluctant to change my routine. My experience was that they seem to get easier if you consistently do them. I assume that's because the muscle strengthens over time. I'm no medical professional nor expert in this area, but I think muscular development takes time and consistency. You can't rush it. Be consistent and watch your technique and it should get easier over time. Just my 2 cents. Best wishes.