I saw the video. it looks pretty good, You keep your elbows in, very good, and you bring you hands back for defense, very good. You got to work on head movement brother ! , bend at your knee's to slip punches, and generate more power, your a little stiff , get some music going in there. a little hip hop for rhythm or some Pantera which is also good bag music . When you throw that str8 left, pivot more on your foot and get that hip in there. follow through. Remember Don't punch to the bag, punch through the bag. Good luck Bro !