New research shows women 45 and older who commit to this low-impact workout for 10 weeks may see real, measurable change.

The Study Making Waves

If you’re dreaming of a slimmer waistline before beach season, the answer might not be another round of crunches or planks. A new review published in the peer-reviewed journal BMJ Open is turning heads for a surprisingly simple reason: the workout in question happens entirely in the pool.

Researchers connected to universities in South Korea and China analyzed 10 separate weight-loss studies conducted across five countries — Malaysia, Brazil, India, the United States and the Netherlands — spanning more than a decade of data, from 2009 to 2021. Altogether, 286 participants between the ages of 20 and 70 took part, most logging one-hour sessions two to three times a week for weeks at a stretch.

Why Water Aerobics Works Wonders

The verdict? Water aerobics led to a measurable drop in both body weight and waist circumference, particularly among women, people 45 and older, and anyone who stuck with the routine for at least 10 weeks. The category covers a few different styles, including:

• Aqua Zumba
• Water yoga
• Aqua jogging

Unlike high-impact cardio or traditional weight training, this style of aerobics leans on buoyancy to take pressure off joints and muscles, making it a rare workout that’s both gentle on the body and genuinely effective at reshaping it. That combination is part of what’s fueling the buzz around the findings — most low-impact routines don’t come with this level of measurable payoff.

The Real Results, By the Numbers

Women who kept up with water aerobics for 10 to 12 weeks lost close to 6.6 pounds on average, along with just over an inch off their waistline. That’s a notable shift for a workout that puts essentially zero strain on the joints, especially compared with land-based alternatives that can leave knees, hips and backs aching after a tough session.

Middle-aged men, on the other hand, didn’t show the same significant weight loss in the review — though researchers suspect that’s more about how few men were included across the 10 studies than a knock against the workout itself. The data also came up short on drawing firm conclusions about body mass index, lean mass, fat mass and hip measurements, so there’s still more research needed before the full picture comes into focus.

Who Benefits Most

Beyond the scale, water-based workouts come with a long list of perks that go beyond weight loss alone. Research cited by AARP has linked water exercise to lower stress levels, sharper balance and stronger heart health — benefits that matter regardless of age or fitness background.

For beginners or anyone nursing an old injury, that combination makes water aerobics an especially smart entry point back into fitness. It sidesteps the joint strain that so often comes with land-based workouts, all while still delivering real, trackable results over time. It’s also a social workout by nature, often done in group classes, which can make consistency easier to maintain than a solo gym routine — and easier to stick with once the novelty of a new fitness plan starts to fade.

Ready to Dive In?

Family medicine physicians have started steering patients toward the pool for exactly this reason. It’s approachable, low-risk and, according to the review, backed by real data showing it can move the needle on both weight and waist size, especially with consistency over a 10-week stretch or longer.

So if a bikini-ready summer is the goal, or you’re simply looking for a way back into movement without punishing your joints, the deep end might be exactly where to start. A few weeks of laps, aqua Zumba or water yoga could deliver more than a cooldown from the heat — it might be the reset your routine has been missing.

Source: The Healthy