What I said above is a home treadmill. The prices of commercial treadmills are generally relatively high, ranging from 10,000 yuan for light commercial treadmills to tens of thousands to hundreds of thousands for commercial treadmills. Commercial treadmills are expensive because the materials will be better, because they need high durability, and the shock absorption methods and functions are more advanced than those of household ones, so they will be expensive, and the brand premium will naturally be more expensive. If you look carefully, there are still cheap instruments, but you must pay attention to safety issues. Dumbbells are heavy enough, but what they sell is weight, and money is calculated by kilograms. The barbell depends on the quality, ranging from more than 200 to thousands. I use thousands of barbells (black bars) here. More than 300 kilograms are safe and will not be deformed. It's 100 kilograms, and it's bent, so I can't come back. There is no toughness at all. If the weight suddenly breaks, the trainer will be seriously injured if he doesn't hang it. Both free weight frame and Smith frame are used in combination with heavy weight training. Steel must be of good quality and can bear enough weight to be safe.