Sorry if this has already been discussed. I'm working on my fitness at the moment, and need to know a few things about swimming. I've just done a 1.5 km swim, which is my first swim since before Christmas, and hope to do this at least once a week, preferrably twice if I can. Is this a good distance to train, or should I try to push it up a bit? I found from a strength point of view 1.5 km was fine, but I did start to cramp up in my left leg towards the end of the session. Will this reduce as I get fitter or is there something wrong with my technique? I've been concentrating on the front crawl, only changing to breast stroke for two or three lengths when I started to get too tired. Is this a good idea or should I try to alternate strokes more? Thanks for your help.