relation between body weight and punching power?

[OMGWTF]

If speed remains the same and body weight increases the punch will be more powerful where ever you put the weight on, since the body is throwing the arm its probably better to have the weight on the body.

Bodybuilding will make you gas, put you in a weight division you dont belong in, and may make punching power increase very inefficiently ie via weight gain or it may even make it decrease if it causes you to slow down too much.

Lifting weights correctly and other resistance exercises can help, bodybuilding however is like an insidious poison to athletes and boxers.

The guy is knowledgeable on boxing good enough for most to learn form he is not an expert though he is a business man and he does get somethings wrong. But most of it is useful. I think My boxing coach and boxing fitness factory are some of the best to learn from.

With regards to his advice on not weight training, well you WILL gain power in your punches if you increase lower body strength and speed, so he is wrong. I mean its obvious, if you know how to throw a cross properly and you drive with the rear leg into the punch, well someone who did squats and plyometrics will
have a faster stronger leg drive and a more powerful punch. (his justification that a punch is elastic etc dosnt hold up because the power flows through the upper body it dosnt come from the upper body, it comes from the lower body, which isnt being used in an elastic way its being used in a normal concentric way)