Pity the poor stepper!
While gym lines form for treadmills, elliptical trainers and stationary bicycles, the stair climbing machine is all too often the neglected wallflower of the cardio room.
Maybe that's because whether you call it a stepper, stair climber or stair mill, it evokes the drudgery of Sisyphus, the character in Greek mythology condemned to push a boulder uphill for eternity.
But experts say if you master the stairs, you'll reap dividends in tight abs, butt and thighs.
"It's the intensity," said Kerri O'Brien of Life Fitness, which designs and manufactures exercise equipment.
"There's a vertical component. You're going to be working harder because you're going against gravity," she explained. "Also you'll have isolated muscle soreness because you're using muscles you're not used to using," O'Brien, an exercise physiologist, added.
But if done regularly, O'Brien promises it will become more enjoyable. It is also a great workout for the muscles that make up the buttocks.
Staircases have been around almost from the beginnings of civilization. In 2004, archaeologists found a stair case in Austria believed to be at least 7,000 years old.
O'Brien said modern steppers evolved from so-called Jacobs Ladders, climbers prevalent in high school gyms of the 1950's.
"And ever since the 1950's, football and track teams have used running up stadium stairs to work out. People also use step climbers to train for mountain climbing and hiking," she said.
It's also an effective low-impact cardio choice. One study of 10,269 Harvard alumni found that those who climbed at least 55 flights of stairs a week had a 33 percent lower death rate.
A British study found that daily stair climbing among sedentary young women resulted in a rise in HDL, or good cholesterol.
Dr. Hank Williford, of the American College of Sports Medicine, thinks steppers are a good fit for women.
"They're not bouncing around like with a treadmill and still they can increase their bone marrow density and prevent osteoporosis," he said.
Michael Karlin, a lawyer in New York City, started using a stair climbing machine to lose weight and wound up scaling all 1,576 stairs of the Empire State Building.
Stair climbing races are held worldwide. The American Lung Association alone holds 57 in stadiums and skyscrapers throughout the United States.
"I competed in the Empire State Building climb last year, finishing in 16 minutes, 3 seconds," said Karlin, who has also raced up the Willis (formerly Sears) Tower in Chicago and the US Bank (formerly Library) Tower in Los Angeles.
"I have derived tremendous benefit," the 38-year-old said.
"My legs are really strong, my sprinting has improved, and my lung capacity is much greater," he said. "Competitive stair climbing pounds my legs and knees substantially less than running."
So how would Karlin feel about French writer Albert Camus' essay suggesting that Sisyphus was happy in his uphill struggle?
"I love preparing for a race, finishing the race, and talking about it!" Karlin said. "Doing the race itself, though, well, that really hurts."