Need Suggestions from people loosing over 100 lbs

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Hi all! I am coming up on my 1st mini goal!!! Yea me! I have 7lbs to loose and for that goal I need a new pair of sneakers. I for exercise I do mainly walking and diffs DVDs (D3L1 right now!) Anyway I have no clue what type, or brand of sneaker to buy. I always wore New Balance but I wasn't working out then. My knees are kind of crummy and I tend to get plantar faciatis sometimes. Any suggestion of a GOOD sneaker?