My 93-year young client has worked out with me for 1 hour, twice weekly for the past 14 years. She recently had a hospital stay during which she was very disoriented. In her effort to sit up and get out of bed, her family reported Helaine must have done over 100 sit-ups in a 2 hour period. As hard as it was on them to quiet and comfort her, they couldn't get over the abdominal strength she had at 93! :)