Make sure this fits by entering your model number. Most convenient cardio exercise: With RENPHO smart jump rope, you can get a more efficient, more low-cost, and happier cardio exercise. The jump rope is lightweight and portable, it is a gift for women to be flexibly used indoors or outdoors. Keep workouts, it will help you keep a fit body and effectively improve cardiopulmonary functions and endurance. It also is the best choice for school supplies for teenagers. Reach fitness goal with APP Renpho Fit: Our fitness skipping rope can connect with our APP Renpho Fit that can easily analyze and track your periodic workout data. You can grasp your skip time, total skip number, calories burned, and tangles to reach your fitness goal at any time.