Paul is referring here to the praise he received for being an eager Pharisee. He speaks of this praise as if he had viewed it in the past as a businessman's profit. AT: "anything that other Jews praised me for" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Paul speaks of that praise as if he were now viewing it as a business loss instead of a profit. In other words, Paul says that all his religious acts of righteousness are worthless before Christ. (See: [[rc://en/ta/man/translate/figs-metaphor]])