Drag the sprites! Press the up arrow to show the dummy facing to the left, and press the down arrow for the dummy to face right. Press c and d to make the dummy become a rock that is smashable. The c key turns it into a rock, and then the d key makes it get smashed into pieces. Press b to make the dummy look like it just got punched. Press a to make the dummy go back to normal.
Credit to ui-ex.com for the Goku sprites! It's secure! :D Give credit if you use my Kamehameha sprite I made.