Forget clunky ellipticals or huge treadmills. Fitness enthusiasts have found a new way to sneak more movement into their day, and it might not be what you’d expect.

The tiny, portable Merach Rocking Stepper is racking up rave reviews on Amazon, with some people calling the compact contraption “addictive” and saying they’ve finally found a “fun way to exercise.”

Plus, ahead of October Prime Day, which kicks off Oct. 6, the simple machine is on sale for just $49. And with an exclusive coupon, shoppers can score a free piece of bonus gear, including this viral Plevic Floor Machine, valued at $27. In other words, this might be the perfect opportunity to double down on your home gym gear before Fall weather sets in.

Unlike traditional steppers that move straight up and down, the Merarch stepper rocks from side to side, a motion designed to engage the hips, glutes and core. Reviewers say they actually enjoy the feeling, and it still delivers a surprisingly effective workout.

“It really makes me feel like I’ve had a full workout after only 10 minutes,” one reviewer shared. “I feel it in my thighs, waist & buttocks. It’s like a good hurt, and I’ve already lost 3 inches in a week.”

Despite being built with commercial-grade steel, the rocker is surprisingly portable, weighing just 12 pounds. It’s also compact enough to tuck beneath a coffee table or desk, so you can sneak in a workout while watching TV or even during work. And, an LCD monitor tracks key workout stats, including time, steps and calories burned — making it easy to track progress over time.

There is a bit of a learning curve. According to users, the rocking motion can put your balance to the test, which might be extra challenging for seniors. But once you get the hang of it, that can also help improve practice mobility and stability, which has been shown to become increasingly important as you age.

It’s unclear how long the popular stepper will stay on sale ahead of the October shopping extravaganza, but for now, it could be an easy way to get a head start on your fall fitness routine.

This article was written by Miska Salemann, New York Post Commerce Writer/Reporter. As a health-forward member of Gen Z, Miska seeks out experts to weigh in on the benefits, safety and designs of both trending and tried-and-true fitness equipment, workout clothing, dietary supplements and more. Taking matters into her own hands, Miska intrepidly tests wellness products, ranging from Bryan Johnson’s Blueprint Longevity Mix to the viral Oura Ring to Jennifer Aniston’s favorite workout platform – often with her adorable toddler by her side. Before joining The Post, Miska covered lifestyle and consumer topics for the U.S. Sun and The Cannon Beach Gazette.