Bowflex SelectTech 840 Adjustable Kettlebell (Single)

Overview

The Bowflex SelectTech 840 applies the brand's dial-selection trick to the kettlebell, collapsing six separate cast-iron bells into a single adjustable unit. A dial on the base lets you switch between 8, 12, 20, 25, 35, and 40 pounds in seconds, so a closet-sized footprint covers the range most home lifters need for swings, goblet squats, Turkish get-ups, and loaded carries. The handle is wide and smooth enough for two-handed swings, and the weight selection mechanism locks the active plates into the bell body while the rest stay parked in the cradle. Because the shell shape stays constant, the balance shifts slightly as you change loads, which purists will notice during high-rep ballistic work, but for general conditioning it is a non-issue. It ships as a single bell, which is the normal way to train with kettlebells, and the modest price makes it an easy add to a dumbbell-focused home gym. If you want kettlebell training without a wall of bells, this is the tidy answer.