How can I act like being shot face down with gun and a machine gun?

-I will participate in a shooting scene in which two men will shot, the first one will shot with a gun or pistol 45 and I will fall face down with my arms and legs extended straight and then a second actor will shot me with a machine gun from behind in that position. I don麓t know how to move my body or react to the bullets, does anyone know some tips? I wanna make a really good believable scene. Any resource or help will be appreciated.



Thanks!