Spinning bike, etc. ~ each kind of equipment will have a corresponding description, and the location where you can get exercise (especially the weight-bearing equipment). Matters needing attention in general indoor sports mainly depend on specific projects. If you don't know your own system, you'd better communicate with the fitness instructor first to avoid injury. On the treadmill, you can't run violently for a long time, because people are passive on the treadmill and can't adjust their speed quickly at any time, especially those with heavy weight. Running for a long time will hurt joints such as knees and ankles. Control the time of walking and running. Walking machine belongs to whole body exercise, but it has obvious effect on leg muscles. Weightlifting equipment must have professional guidance, otherwise it is easy to cause injuries because of irregular movements or mistakes. Another thing to note is that when doing weightlifting, you should know the parts you want to exercise, and each machine is very specific and targeted.
I hope my answer can help you.