{"subtitle": "an Exercise Guide from the National Institute on Aging", "first_publish_date": "2006", "key": "/works/OL13741855W", "authors": [{"type": {"key": "/type/author_role"}, "author": {"key": "/authors/OL6583968A"}}], "subjects": ["Exercise", "Physical fitness", "Older people, health and hygiene", "Exercise for older people", "Physical fitness for older people", "Middle-aged persons", "Health and hygiene", "Older people"], "title": "Fitness over Fifty", "type": {"key": "/type/work"}, "latest_revision": 5, "revision": 5, "created": {"type": "/type/datetime", "value": "2009-12-11T10:29:07.774521"}, "last_modified": {"type": "/type/datetime", "value": "2020-12-14T03:34:11.658702"}}