Please, welcome in Japanese.
We use it in our training. We train aikido ofcourse ;-))
Saying "Onegaishimasu" shows respect to our opponnent. We can train safely together. We respect each other. I love this attitude and I feel very good with it.
Showing respect in the western world is not common. Actually, in the western world we are a bit rude or a bit more rude. ( Sorry for my language, don't know if this explains the good way).
As you may know I am a fan of kindfulness. I practice this every day.
Every morning I say to myself watching ME in the mirror: "Hi Kit, you're great". Or something else nice. This helps me to feel even more happy instantly. Feels great every time again. And I laugh about myself . . .
By practising aikido I also learn the Japanese culture and I learn a lot from that. The Japanese people who I know are so friendly and really kindful. I feel humble every time when I experience this natural kindfulness.
I love this!!