Go get gait analysis at Sweatshop or some other reputable running shop, you won't regret it- not least because they have a 30day no quibble guarantee, so if they're not quite right, you can take them back and swap them, even if you've run outside in the mud! Hope you're shins are ok
Getting gait analysis for footwear is a good idea, but tbh in the first few weeks, especially on a treadmill, is really not that essential. You will have some aches and pains as your feet an legs an joints get used to the new demands you put on them but you can deal with that.
Who are you?
(here you say I am a Spartan!, and pound that treadmill as though it were Xerxes himself.)
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