Hello RQ! I'm a swimmer too and I was advised by a chiropractor to alternate backstroke with crawl or breast stroke too. I normally go up the pool one way, then down the other. Swimming is meant to lengthen your muscles too, although to be honest, I'm not quite sure why that's good. It SOUNDS good somehow, so I'm happy with that!! You're right about it being a total body workout too. Front crawl will get your heart going faster if you get the hang of it properly - it's a bit harder than the other strokes. Does someone at your pool do one-to-one lessons? At ours in the summer hols there's a lady who does lessons like that, and you can book just what you need - two or three, ten or twenty sessions! Maybe you could find someone like her to teach you - I bet you'd get it in 2 or 3 goes if you're such a water baby already??
Good luck! xx