NOW WRITING FOR PJ MEDIA, I’M HAPPY TO SAY: Mark Rippetoe: Strength vs. Endurance: Why You Are Wasting Your Time in the Gym. “The fact is that a properly designed strength training program constitutes a much better use of the same amount of time a ‘cardio’ workout takes, and provides far more benefits to your quality of life. This is especially true if you are older. . . . The loss of muscle mass means the loss of strength, which means the loss of physical capacity. An old weak person is not nearly as much fun to be around — or as fun to be — as an old strong person. As we grow older, one of the primary regrets is that we can’t do the things we used to be able to do. Staying strong solves many of these problems. Staying strong also prolongs life, which is a good thing if you’re strong enough to enjoy it.”

I promise you this: If you do the squats and deadlifts at proper levels of weight, your heart will beat plenty fast.

And here’s his book.