Professional name: elliptical cross training machine. I usually call it a cross machine, similar to a treadmill. They all do aerobic exercise. The main difference is the diversity of exercise methods. Many people are always running on the treadmill, which is very boring. In addition, the cross machine can also combine the exercise of upper body muscles with the coordination of the whole body

If I have skinny legs, I'm not very professional. I think I need to do more leg muscle stretching to make my muscles feel more linear.