"Smart" dumbbells measure the wearer's heart rate, they have built-in motion sensors that inform the athlete about errors in the exercise technique through the application or by signal. The gadget collects statistical data on training, helps to correctly repeat exercises after the trainer from the broadcast. For greater safety, the sports gadget has a rubberized case. All data collected by smart dumbbells is transmitted to a single online platform. This allows owners to compete with each other even remotely, which adds a playful element to the workout. The trainer gets the opportunity to continuously and remotely monitor the workouts of his clients, give them personal recommendations, and draw up individual work plans.