It’s Your Last Chance to Get Adjustable Dumbbells (That Turn Into Kettlebells!) for 38% Off for Prime Day

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Prime Day 2025 ends tonight, and Lifehacker is sharing the best sales based on product reviews, comparisons, and price-tracking tools before it’s over. 

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Please allow me to (yet again) preach the beauty and utility of adjustable dumbbells: no gym membership required, no waiting for equipment, and no excuses about not having enough space. Where individual pairs of dumbbells from five to 80 pounds in five-pound increments would cost well over $1,500 (and take up your entire home gym), adjustable dumbbells condense an entire weight rack into a compact, versatile system.

So, if you’ve been waiting for the perfect moment to upgrade your home workout space, this is it. With just hours left in Amazon’s Prime Day, the Feierdun Adjustable Dumbbells are the perfect budget option—down 38% to $79.98 for a 22.5-pound pair. For those serious about their strength training, the 90-pound set is available for $169.98, saving you over $100 from the regular price of $289.99.

FEIERDUN Adjustable Dumbbells

$79.98
at Amazon

$129.99
Save $50.01

Get Deal

Get Deal

$79.98
at Amazon

$129.99
Save $50.01

Compare the $169.98 for a 90-lb. adjustable set to purchasing individual fixed dumbbells—you’d easily spend several hundred dollars more for the same weight range.

Having tested several brands and models, I’m especially drawn to how the Feierdun system goes beyond traditional adjustable dumbbells by functioning as four different pieces of equipment in one. You can configure them as fixed barbells, kettlebells, traditional dumbbells, or individual weight plates. I mean, incorporating kettlebell swings and goblet squats without purchasing separate equipment? That’s a steal.

While their manual adjustment system might seem old-school compared to quick-dial mechanisms, it offers distinct advantages. You physically screw your desired weights and connectors on and off, which creates a more secure connection than some quick-adjust systems. The safety nuts should keep the dumbbell pieces solidly locked in place, preventing the annoying weight shifting or rattling that can occur with lesser-quality adjustable systems. After all, when you’re pushing heavy weights, especially during dynamic movements, you want absolute confidence that your equipment won’t fail.

Still, if your priority is a quick-adjust mechanism, Feierdun has a dial system set currently 15% off for prime day, down to $329.99. Or, if you’re willing to spend a little more, my favorite adjustable dumbbells are the Nuobells—currently a modest 6% off right now, bringing them down to $590. Otherwise, if you’re a true beginner and don’t anticipate needing more than 10-pounders, I recommend the Merach set currently marked down 15% for just $43.31.

Once you secure your dumbbells of choice, check out my 15-minute adjustable dumbbell workout tailored specifically for runners who are short on time, like me. For more, check out all the best deals on fitness equipment that end in just a few hours.

Looking for something else? Retailers like Walmart, Best Buy, and Home Depot have Prime Day competition sales that are especially useful if you don’t have Amazon Prime.

• Walmart’s Prime Day competition sale runs through Sunday, July 13 and includes deals up to 50% off. It’s an especially good option if you have Walmart+. 

• Best Buy’s Prime Day competition sale, “Black Friday in July,” runs through Sunday, July 13 and has some of the best tech sales online. It’s an especially good option if you’re a My Best Buy “Plus” or “Total” member.