किस मार्शल आर्ट का शाब्दिक अर्थ 'खाली हाथ' या 'बिना हथियारों के मुकाबला' होता है?

Judo, the modern martial art and Olympic sport, had its historical origins in the ancient martial arts traditions of which country?

Which martial art uses a bamboo sword called a 'shinai' for practice, focusing on strikes, thrusts, and controlled combat techniques?