aerobic sets which makes sprinters puny and weak

I would like some advice from you more experienced sprinters. I swim 50, 100, and 200 back and fly, and occasional medium distance freestyle (because my sprint free sucks.) I have been swimming Masters for about 5 years, and I am a somewhat regular top ten (but not top five) swimmer in my 6 events. To date I have done no weights or out of pool work at all - I swim for an hour an average of 5 or 6 times a week. I would like to improve my stroke sprints. It will be very difficult for me to add more workout times to my week. Should I keep up the swim workouts that I do, or should I exchange a couple of them for a weight workout? If I do that, will my 200's get hurt? Would I be better off adding 10 minutes of abdominal work instead?

I would like some advice from you more experienced sprinters. I swim 50, 100, and 200 back and fly, and occasional medium distance freestyle (because my sprint free sucks.) I have been swimming Masters for about 5 years, and I am a somewhat regular top ten (but not top five) swimmer in my 6 events. To date I have done no weights or out of pool work at all - I swim for an hour an average of 5 or 6 times a week. I would like to improve my stroke sprints. It will be very difficult for me to add more workout times to my week. Should I keep up the swim workouts that I do, or should I exchange a couple of them for a weight workout? If I do that, will my 200's get hurt? Would I be better off adding 10 minutes of abdominal work instead?