In recent years, due to the impact of the Covid-19, home exercise has become a trend. As one of the most popular sports equipment, some products of spinning bikes have gradually shown their shortcomings. Stability is the foundation of a spinning bike. The X4S uses customized special-shaped tubes for the handlebar and seat cushion adjustment tubes. After the knob is locked, the V-shaped structure on the top provides enough support to ensure that it will not sway from side to side, giving the user a sufficient sense of security; while ensuring the stability of the spinning bike, the product increases the flexibility of movement. After extensive calculations and tests, when moving the bicycle, the user only needs to press down on the handlebar until the center of gravity is shifted above the moving wheels. At this time, the rubber pad is off the ground and the moving wheels are on the ground. Users can easily move the product without fixing the front stabilizer with their feet; the product adopts a 14kg large flywheel (stainless steel + aluminum ring) and 6 pieces of N42, 3200GS strong magnets to ensure enough resistance to meet the user's exercise needs; the product adds a resistance value measurement device, and the monitor can display the resistance value in real time.