At 80 years old, Ernie Hudson looks like he could still haul his proton pack all the way up the stairs to the top of 550 Central Park West to battle the Stay Puft Marshmallow Man.

Jane Fonda wears many hats: Oscar winner, Emmy-winning TV star, political activist, and exercise pioneer — still. The 87-year-old actor paved the way for the at-home exercise industry almost 42 years ...

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Members of the royal family are fans of this routine, too.

When we look back at the 1980s, the memories are often loud and colorful: big hair, even bigger shoulder pads, and a whirlwind of questionable “health” fads. (We’re looking squarely at the era of ...