pain barrier
The peak of physical pain, discomfort, or exhaustion, especially during exercise or exertion, past which the intensity begins to lessen. Come on, keep pedaling, keep pedaling! You can go past your pain barrier, come on! Hey, take it easy—ignoring your pain threshold every time you exercise is a great way to get injured.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.