I tried what you said, I must be doing it wrong, because I couldn't quite tell. What I've read (and experienced) is that the larger lunge targets the upper areas more - the hamstrings and the butt (and that elusive little area where the two meet), while having legs closer together will work the quads more.
generally you are better off with a normal lunge. feet on railway tracks striding forward a reasonable amount but not too far. Try it with almost just slightly lifting your front toes off the floor then drive up through the heel. Really drill that front heel into the floor and then push up off it. Hopefully that will help. Can be hard to explain though. It's good that you are exercise though, too many people don;'t do any, using the classic excuse of 'I don't have any time.'
Maybe I'll try it in a few days once I walk off yesterday.
wads
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