JaxJox KettlebellConnect
A bullet-style stacking system lets the JaxJox KettlebellConnect adjust from 12 to 42 lbs. in just seconds — but space-saving convenience is just part of the story. The rest lies in the six-axis motion sensors that track your movements while using it, recording your reps, sets, weight, power, and workout time to a companion app. The lithium-ion battery lasts for 14 hours on a single charge, and each one supports up to nine users, so your entire tribe can use it.