There are more than 20 sets of treadmills in the gym where I apply for a card. The ones in the south are newer and the ones in the north are older. The new treadmill is faster than the old one. Personally, I feel that the speed of 10 km on the new treadmill is equivalent to the speed of 1 1 km on the old treadmill.
An old machine is extremely slow. The speed of this machine is about 2 km/h slower than the old machine on the side, which means that this treadmill runs 12 km/h, and its strength is similar to that of the machine next to it.