Can you define back pumps

Lower back I flames and kidneys feel like they're going to pop. Never had them, just my forearms, they can get so bad I have to use machines and take long breaks
 
Like the worst cramp that takes awhile to go away. They are manageable but can literally be excruciating heavy hamstring curls always get me so in very careful on cycle
 
Yes, think cramp not pump. Not sure why we call them pumps instead of cramps. We love a good pump but there’s nothing good about these.
 
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