Why does exertion make you wince?

[Porridge GTI]

Does it really help complete that last rep?

[Kenny Powers]

Pain?

[Porridge GTI]

Why does pain make you wince?

[Kenny Powers]

Because it hurts?

[Hoofy]

Tension in the body and the mind, perhaps.

[Trophy Husband]

It is exercises version of the come face. Try and avoid that one!