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Byline: --SARAH VAN BOVEN
Heartbeats per minute, reps and sets, body-fat percentage--exercise has lots of numbers, all of which have an effect on that critical one that pops up on our digital scales. A long, hard look at how we've worked out over the years.
26,831: Number of health clubs in the United States in 2005.
16: Percentage of Americans who belong to a health club.
30: Minutes per day of moderate-intensity exercise the Centers for Disease Control recommends performing five days per week.
2: Number of hours per day President Thomas Jefferson advocated be spent walking, horseback riding, or practicing some form of exercise.
1856: Year Catherine Beecher (sister of Uncle Tom's Cabin author Harriet Beecher Stowe) popularized calisthenics for women, set to music.