i can't punch hard

[wheelin&dealin]

A body can produce more force based on a list of factors:

-Improvements in general strength. (Try improving your squat, deadlift, bench, rows, cleans)

-Improvements in explosive strength (Try doing sprints, medicine ball throws, plyometrics)

-Improvements in core strength (Try low intensity ab work, high reps)

-Improvements in technique

-Gaining weight

 

[silverfox]

On a slight tangent, Muay Thai hand techniques tend to be weaker or less focused on than those of western boxing. Part of this comes from the stance which was touched on earlier and part of this comes from the fact that in Thailand a punch is the lowest scoring technique with head kicks and throws from the clinch racking up the points.

If you really want to learn to work the bag then work with a boxing coach.