South Shore Hospital is offering fitness classes for children and seniors this summer, with spaces available in both. Shape Up Fitness is for children between the ages of 10 and 16 and meets twice a week for five weeks on Monday and Wednesday afternoons in the pool and gym. Enrollment is ongoing and the cost is $40. Senior exercise programs focus on building strength, endurance, and flexibility. More information and registration is available by calling 781-624-4367.