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Strength training is key to staying healthy as people age, with experts recommending working major muscle groups at least two days per week.

Marfred Suazo, a fitness professional known as Fonz the Trainer in New York City, has worked with thousands of older adults to build strength and longevity .

Suazo spoke with Fox News Digital about which muscles are most important for seniors to target. (See the video at the top of the article.)

FITNESS EXPERT REVEALS 6 PILLARS OF STRENGTH TRAINING THAT OLDER ADULTS SHOULD MASTER

"Most people train what they see in the mirror — chest, arms, quads and maybe abs if they’re feeling ambitious," Suazo told Fox News Digital. "That’s what I call ‘mirror training.’"

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