New study finds active older adults have similar muscles to 25-year-olds

A new study finds that the muscles of older people who have exercised for decades are indistinguishable in many ways from those of healthy 25-year-olds. NBC News medical contributor Dr. Natalie Azar talks about the research, and Don Saladino, certified strength coach and owner of Drive 495 gym, shows off some muscle-building moves.