Jack LaLanne

Fitness guru Jack LaLanne knows push-ups. During his 30-plus years on television, he regularly demonstrated the proper push-up technique and wowed us with feats of strength like finger-tip push-ups and one-armed push-ups.

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Mr. LaLanne, 93, still does push-ups during his daily 90-minute workout. “I hate it,'’ he said of working out. “But I like the results. Exercise is something you’ve got to do the rest of your life.'’

I was fortunate to speak with Mr. LaLanne for my Well column in this week’s Science Times, which explores why the push-up remains an enduring symbol of fitness. The article also explains why your ability to do a push-up is linked to how well you age. Here’s a calculator to tell you how many push-ups you should be doing.

Read the full column here, and be sure to check out our new Well video segment, “Drop and Give Me Twenty!,” above.

How’s your push-up performance? Post your comments here.