Are there any swimming techniques that require a partner or any you can do with a partner?

Question

what are they? what do they entail?

thanks.

Answer 1

well you can judge eachother swimming???

Answer 2

well rescue manuvers require a buddy...

Answer 3

My coach used to have us get a partner and one would get out and watch the others stroke to try to help the other and then switch.  Also we would have to do a 200 IM and we each had to do 2 of the strokes and you had to try and find out what combination would get you the best times.