I am a 16 year old male and I am 6 foot 1. I am into boxing however I do not go to the gym I do alot of work at home, I have a freind of the family who is an ex-boxer and my dad both help me work out etc. I do alot of work on the Jab / Target Pads I also do weights, punch bag, pull up bar, sit ups, press ups and some running most days. However I cannot seem to get my left hook to improve, I have improved my right hook alot. Is there any tips on how I can improve all my punching skills but mailnly my left hook?