Dick Van Dyke will turn 100 years old on December 13, but the television legend has no plans to slow down.

One secret behind his youthful energy? He never skips a workout. In an excerpt of his new book 100 Rules for Living to 100: An Optimist’s Guide to a Happy Life, published in The Times, the Tony-, Emmy-, and Grammy-winning star revealed his extensive routine at age 99.

Putting many millennials and Gen-Xers to shame with his dedication to wellness, Van Dyke writes that he visits the gym three times a week. “If I miss too many gym days, I really can feel it—a stiffness creeping in here and there,” he writes, adding, “If I let that set in, well, God help me.”

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