Boston Health & Fitness Expo. Hynes Convention Center. Boston. 10:00 a.m. to 5:00 p.m. Free. The exhibit will feature the popular Heartbreak Hill Challenge with treadmill simulations, bone density screenings, musculoskeletal screenings, and a life-size replica of Milton Bradley's Operation game. Children are also asked to bring in their Teddy Bears or other favorite stuffed animals to get "evaluated and treated" at our Teddy Bear Clinic. Celebrity guests from the sports and entertainment world will also be on hand. www.bostonhealthexpo.com