Stomach
he has a weak spot for red heads
After bathing in the River Styx his "Achilles Heel" or weak spot was his underarm.
terds
his weak spot
Achilles' heel was his weak spot thus the saying that someone's weakness is their "Achilles heel."
Virgos
In the crust the weak spot we have is the Magma Chamber. But, deep down to the mantle such weak zone is the Asthenosphere.
The weak spot of an alligator is it's somach
his pride
His heel
terds
An "Achilles heel" is a person with a weak spot.