The most effective bike I have ever used is the air bike. The key is to ride backwards. The key point is to massage the legs after finishing, otherwise there will be muscles pressing from bottom to top, and then shoot again. You must insist.

The ballet dancer must have long muscles. Good thing I didn't practice. My classmate practiced until she regretted it.

After the 90-degree one, you should also have a massage. In short, any activity should be massaged. That's ok, but I can't see any effect.

Jumping rope is good. It's better to have a thinner stomach, but your arms tend to get thicker. . .

I hope I can help you from my personal experience.