The only advice I can offer is don't duck your feet out too far. For the longest time I was ridng with my feet ducked, then I tore my acl wakeskating and during physical therapy they had to keep telling me not to duck my feet on machines and stuff, it puts your knee as at a bad angle and with us women we are more prone to knee injury anyway so now I have changed my stance to have almost no duck and I have my feet a little more than shoulder length apart. I would say try setting your board up exactly shoulder length apart and see how that feels, then make small adjustment from there until you find a comfortable stance. With the sore back... you're prolly just using muscles in your back that you haven't used much, when you're back starts to get sore, switch it up and practice your switch riding. At the start of every season my back (among other things) is always killing me, but switching it up defenitly helps me take more/longer sets.
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