The musician Jay-Z and the tennis star Novak Djokovic have joined the investment team of CLMBR to support next year’s launch of the CLMBR Connected and CLMBR Pure vertical climbing machines for fitness training. Both machines have touch screens, an audio system and a tracking app to deliver on-demand, instructor-led classes. Their design patent is pending. According to CLMBR’s founder and chief executive, Avrum Elmakis, these machines are easier on the joints than bicycles, treadmills or rowers.