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- Everyone knows exercise is good for you, but many of us don't do enough.
- Longevity expert Dr. Michael Roizen shared how he fits exercise into his busy schedule.
- He has a walking desk to help him hit 10,000 steps a day, and parks his car one mile from work.
A busy doctor and longevity expert who says he's reversed his age by 20 years shared with Business Insider how he finds time to stay fit.
Dr. Michael Roizen, 78, chief wellness officer at Cleveland Clinic and author of books on longevity, claims his "biological age" (a concept experts are divided on) is 57.6.