The wrestling challenge

It's a beautiful day and everybody is enjoying the party that you have organized. Your guests are drinking in the garden around the pool; you have invited, among the others, your best friend, Laura, and your boyfriend Liam. Your younger brother, Josh, was not supposed to join your party, but he's refused to live and therefore you had but to accept his presence. While you are chatting with your friends you got many questions about your recent and strange (to them) love for martial arts. You say that you have been practicing jiu jitsu for almost 10 months and it is really thrilling. Unfortunately though someone interrupts the conversation, mocking you..