Does anyone have any tips for exersies that will help me im
prove my butterfly???

strengthening your abs will help loads, a weak stomach puts the force on yr back. Iv been doing roll outs, these u can do using a barbell with some small weights on. From your knees keeping your arms straight roll it away from you as far as possible, to start with your back will hurt because its trying to do the work so build up the stretch over time, at stretch, pause then u need to roll it back keeping your arms straight to the start. Does that make sense? Its eaisier to show, eventually you will be able to support your body at full stretch. I believe you can do it similarly using a reebok ball but I have not tried that. Also u could do 3 sets of sit ups as;
20 crunches;12 side bends (on each side); 12 'v' sit ups and 15rocks. I just do these twice a week, iv been doing it with a land training program with weights i have been following for a couple of months and it seems to be helping! The biggest gains seem to be from stronger abs cos in the next days training you can really feel them!! good luck
M@t

Lookin at yr age (iv jsut cehcked yr profile) i wouldnt think you would be needed to 'pump iron' just yet, work with your body weight will be enuf to build your core strength, so press-ups, burpees and squats will all help, do you not do anything like that in your training to break the swims up sometimes?

i think you cant use this exersies :
http://www.svoemmespecialisten.dk/shopexd.asp?id=202
it is a elekstik you can use to better at pulling in the water..
you cant bay it in so many swim shops!
if you wanna know more, cant you write to me!