Elaine LaLanne, who helped revolutionize modern exercise, is a model for aging well.

This post comes from The New York Times Instagram: @nytimes

For nearly six decades, LaLanne was both wife and business partner to the television personality Jack LaLanne, who is widely considered the father of the modern fitness movement, and whose exercise show ran for 34 years, from 1951 to 1985. At nearly a century old, she reminds herself each morning,

“You have to believe you can.” She said that belief had not only kept her physically active through injuries and emotional obstacles, but it had also helped her to live the life of someone decades younger.

While Jack was a natural showman, Elaine preferred to work behind the scenes, supporting him and managing their sprawling entertainment and entrepreneurial empire.

Which included not only a TV show but also dozens of fitness gadgets, food products and supplements, as well as a gym chain with more than 100 locations nationwide. Since her husband’s death in 2011, LaLanne has quietly cultivated a following all her own.