You mean the core strength? Which is the core muscle group. Core muscle group is responsible for stabilizing the center of gravity and transmitting strength, which is the main link of the overall force, and plays an important role in the activity and force of upper and lower limbs. Strong core muscle groups play a stabilizing and supporting role in body posture, sports skills and special technical movements in sports. Many sports need good core strength, such as basketball. The core strength is strong, the pace and movements are stable in the confrontation, and the actions such as pulling the pole and abdomen can be completed in the air. Core strength improves sports performance.