That was fast. After years of contentions that McDonald’s Happy Meals were little more than a vehicle to shamelessly lure kids to junk food with toys, the fast food chain this week decided to try something new: pairing fitness trackers with some of its Happy Meals. The so-called “Step-it” pedometers, blinking lights and offered in six colors, were supposed to replace the variation of toys that usually accompanies Happy Meals for a limited time in the U.S.