THE ANTICIPATED studio expansion opens next week at Heartbeat House, 3141 Glendale Blvd. The neighborhood dance and exercise studio opens an expanded lobby and studio floor, adding 450 square feet where Black Maria Gallery once kept its Under the Table store. Heartbeat House improvements include a new bathroom and shower, and new sound-proof windows and doors. The studio will be closed April 29-30, with a grand re-opening Saturday, May 1. For the big event, Saturday classes will be $5 each. Expect raffles and heart-healthy snacks, too.