Proper punch technique

[Vitez]

I see Lipton talks about it and this guy here as well

http://www.youtube.com/user/albertpo...11/B1sxKDill2c

I think I know what's missing - that torso lean.

Is it better to practise it on double end or heavy bag?

[Hudson52]

Yes it is a nice technique and thanks for sharing here and it is new for me and i have got plenty of idea on punching.