First lady Michelle Obama, in an interview with SiriusXM host B. Smith being aired to mark the third anniversary of her “Let’s Move” campaign, said that allowing students to get up and move around helps them concentrate better and get better test scores, the Washington Post reports. Here are some quotes from the interview on “The B. Smith and ‘Thank You Dan’ Show” on SiriusXM Urban View, channel 128, first aired Tuesday and again Wednesday…