Perhaps if you read the following verse instead of plucking one verse out of context, Paul would have answered your questions already:
“For it is God which worketh in you both to will and to do of his good pleasure.” Phil 2:13
Seems Paul agrees with me that it is God doing the “work” referred to in verse 12.
I will ask you again, what does Paul mean when he says, work out your salvation?
Please be very specific in your response. How does one work out your salvation? if everything is predestined by God? The clear language of Scripture shows you have to do something work out- to obtain salvation.
If that were true, Paul would have said 'let God work out your salvation.' but Paul did not say that. He told YOU to work out YOUR salvation.