Saving Player Stats with module script

What is the best way to use module scripts to save player data?
I’m creating a game where the player acquires a kind of muscle memory, where each gym exercise he does is added to the respective equipment value. What’s the best way to save these values ​​and then get them again to be able to multiply?
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note that in this script I am using powermultiplier, but this value will be replaced later by the respective value of each exercise as the player executes each one.