A famous bodybuilder once said, "Health and fitness is who I am. It's what I do." Well, what about you? Where do health and fitness rank on your list of priorities?
In order to be fit, working out is a necessary component. Likewise, if your soul has been saved through faith in Christ, then it is incumbent upon you to "work out your salvation" by living everyday for the Lord. A person can only work out his salvation if he has actually received this free gift from God.
"The gift of God is eternal life in Christ Jesus our Lord." (Romans 6:23) "For it is by grace you have been saved, through faith - and this not from yourselves, it is the gift of God - not by works, so that no one can boast." (Eph. 2:8,9)