Is it necessary to practice chest and back in order to improve sports performance? Will it affect running and long jump? Fitness to improve sports performance should be combined with strength training that contributes to sports performance, such as leg strength and upper limb strength training, without deliberately practicing chest and back muscles. In order to improve the performance of running and long jump, it is necessary to improve the speed and jumping ability, so we should pay attention to the training of leg strength. Practicing chest and back muscles may increase the resistance during exercise, which is not good for improving the performance of running and long jump.