Jesus died ONCE for all.
What about *It is finished* is so hard to understand?
Christ filled the righteous requirements of the Law which is why death could not hold Him. When we are forgiven by Him and found in Him, the fulfillment of those righteous requirements of the Law are credited to us.
*Forgiven* is past tense.
Philippians 3:9 ... and be found in him, not having a righteousness of my own that comes from the law, but that which comes through faith in Christ, the righteousness from God that depends on faith— ....
The righteousness we have is righteousness given to us because we exercised faith and honored God by taking Him at his word, not a righteousness that we think we earned by any number of works.
Human Pride gets in the way....the need to feel significant somehow....to die to ones self achievements is hard for most....harder still for those who have a church which requires they levels of achievement.
To accept the "finished work of Christ' in entirety means one can see the depravity of man in himself....that usually only occurs the closer we become to Christ in our relationship with him....the more we see Him for He he is... the more we also see how far from His righteousness we are.....but the more grateful we are and greater love for Him we have for seeing there really isn't anything in us worthy....
... But because He stepped in front of us...bearing the guilt and shame...and the death sentence for us...we are truly forgiven....and His Resurrection evidenced death is swallowed up in Victory .....So that..." NOW there is no longer ANY condemnation to them who are in Christ Jesus."
Finished....Indeed!...otherwise...defeated and lost...
Serious question: How do you know that you did this - for sure. E.g., is it measured by the amount of your certainty that you are going to heaven?
Exercise sounds like work to me. I thought you Calvinists were pick from a hat at the beginning of time and things like exercise were some heretical notion held by those stupid unelect Catholics. Welcome home!