I've recently started swimming again and I'm doing between 50 and 75 lengths per session (1 hour). I'm doing a ratio of 2:1 in favour of breast stroke, with the other stroke being front crawl. I met some guy who 'claims' he was a Navy Seal (if you saw him you'd understand my scepticism) and he says I should scrap the front crawl and replace it to side stroke on a ratio of 7:1 in favour of the breast stroke. Does anyone have any opinions/advice on this? I don't really see how side stroke is useful apart from in open water...eventually I would like to take the Army divers course, but for fitness purposes is sidestroke worthwhile?