yeah good point eddieson, if you punch hard with the rear arm then it'll be more compressed initially (bent) and then the force will come more rounded as the left shoulder snaps back and the right shoulder* drives the arm forward.
* more shoulder = more effort and force
At the minute the force is coming through upwards from the elbow only and gives it a weak effect.

Its improving well though some guy, you should have some cool animations by the end of the challenge

Si