The 4 Best Adjustable Dumbbell Sets, Tested by Certified Trainers

"The Nüobell is the best blend of reliability and authentic dumbbell feel I’ve used," says Samuel, who has been using these for over three years. "The shape and design of these 'bells make them ideal for accessory motions, like skullcrushers and biceps curls, and they’re easy to hold for goblet squats too." Aside from a few scratches, they've held up great to three years of heavy use.

With up to 80 pounds of weight per dumbbell and a feel that's nearly indistinguishable from traditional 'bells, users can utilize the same set of weights for a complete full-body workout. Users can quickly drop down to lower weights for exercises like bent-over flies or pile on the plates for more intense squats. "It features a 'turn-and-click' design rather than just a built-in selector," notes Williams. Users simply turn the handle until they reach their desired weight.

During testing, Howell noted that the Nüobell arrived assembled and was easy to plug and play once unboxed. Of all the adjustable dumbbells he tried, these felt the most like actual dumbbells. "These feel like the next evolution of the traditional dumbbells we have become used to in gyms," Howell said.