DAILY PHOTO: Stone Heads of Sno
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For example: being punched in the face and swimming in open waters.
As for how, to my knowledge there’s only one way to overcome any fear and that’s exposure to the fearful stimulus. e.g. One loses (at least greatly reduces) fear of being hit by sparring.

deep brown river
drags many fields’ of soil
to the sea each day.
Little Lamb who made thee
Dost thou know who made thee
Gave thee life & bid thee feed.
By the stream & o'er the mead;
Gave thee clothing of delight,
Softest clothing wooly bright;
Gave thee such a tender voice,
Making all the vales rejoice!
Little Lamb who made thee
Dost thou know who made thee
Little Lamb I'll tell thee,
Little Lamb I'll tell thee!
He is called by thy name,
For he calls himself a Lamb:
He is meek & he is mild,
He became a little child:
I a child & thou a lamb,
We are called by his name.
Little Lamb God bless thee.
Little Lamb God bless thee.