Thunder Thighs is an item added in The Binding of Isaac: Rebirth. The item changes Isaac's appearance, giving him broader hips. Grants one heart container, reduces speed and allows Isaac to smash through rocks, vases, mushrooms, cysts, and skulls without the use of bombs. 

It is advised to use caution when smashing mushrooms, as mushrooms have a chance of releasing poisonous gas when destroyed, knocking Isaac back and dealing half a heart of damage (this does not count as an explosion.) 

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