It takes both stamina and strength, man. Your progress is evident in the video you made. The only problem is that I don't know if it's a good idea to use it for flirting, though flirting is something that varies between cultures so it's not right for me to give my opinion XD
I didn't use it for flirting, but I was asked what I do during my spare time so I was just answering a question 😂