Why see Japan? O-legs are legs together with a gap in the middle. O-legs are mostly formed by bad walking habits, or are born with symptoms of calcium deficiency. If they are corrected, they can be used. A colleague of Legge Leg Beauty Instrument Company bought an instrument called Legge Leg Beauty Instrument. He can wear it to work, but he can't see it under his pants. This thing is quite good. I tried it and decided to buy it. It's been worn for 2 months now, and it feels good. I can adjust my strength. Playing basketball doesn't matter.