Starting in Waltham in 1974, the Massachusetts Gymnastics Center has been providing lessons for kids all over Massachusetts. The Colarossi family has owned the center since 1984 and now also operates gyms in Westboro, Sudbury, Pembroke and Hingham. At the Hingham location, the gym is in the same complex as the South Shore Baseball Club and has a full layout of equipment, including thin and large mats, a balance beam and uneven bars. In addition to classes, the center also offers summer camps and birthday parties for up to 16 children.