Roller rink Skate King in Bellevue fills Tuesday “dead time” with a session exclusively for parents with strollers. The midday sessions are popular with moms looking for a safe fitness activity without daycare needs, and of course there’s socializing and “oldies” (which now means 80s music, sorry all you 30-somethings!) as you circle the floor. And one woman shows up without a kid, just a stroller (and reportedly she used to add a bag of flour), to practice her skating.