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Stephen...

Mostly the shoulders. One, you have to lift the sledgehammer up into the air. Two, you have stop the hammer from hitting you in the face, and that takes serious shoulder strength. It is very simmilar to foward raises.

Answered by Stephen... 1 month ago Report Abuse

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WIUtone...

Good answer but it works much more. Smashing a sledgehammer into a tire would mainly incorporate your body to use your deltoids(shoulders), lats( from lifting the sledge hammer and swinging it) fore arms, rhomboids, traps.

Minor muscles being used would be the many tendons and minor muscles throughout the chest having to stabilize the force of your swing and the force put back through your body due to the bounce created from the hammer smashing into the tire.

The reason it works all these muscles is due to the shock once you hit the tire. Youll feel the bounce and ricochet going through all of your upper body which means your body's muscles are stabilizing the shock.

Think of it as Newtons law of every force has an equal reaction force produced. Smashing the tire with such a force, the force is being put right back into you.

MY View of the muscle that is worked the most are the forearms this is due to holding onto the sledge hammer, having to grip it through the whole move and it is also where the ricochet begins and sends the force back throughout your body.

Answered by WIUtone... 1 month ago Report Abuse

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