1.WITH SMARTPHONE HOLDER: Revolutionize your workout routine with our rebound abdominal elbow support wheel. With the builtin smartphone holder and timer, you can effortlessly track progress, adjust intensity and watch videos, making plank and core training a fun and comfortable experience. 2.Raised Armrest Design: The elbow support rebound abdominal wheel with armrests reduces the strain on your arms and shoulders, provides extra stability and effective support for your body during exercise. 3.Convenient to carry: Easy to assemble, enjoys a smooth rolling that does not damage the floor, and features high portability, ensuring that your workout can be done anytime and anywhere. 4.Convenient to use: Improve your core workout with our rebound abdominal elbow support wheel. Take a minute break between sets, ideal for beginners with 3 sets of 10 repetitions and optimal for 3day weekly routines.