Gym training also includes equipment, gymnastics, self-weight training and other rich content. Grasping some side effects brought by single instrument training to deny the rationality of gym training is to generalize. Here are two.
The scientific training system is not divided by venues, nor is it closed. Now it is easy to see someone doing "six arts" in the gym; It is also common that street sanitation is equipped with fixed trajectory training equipment (including self-made). It's not good for the public to reject the strengths of others and stand up and talk without pain. This is three.