A workout is a schedule or program of specific exercises, especially one intended to achieve a particular goal. It involves engaging in any activity that requires much physical or mental effort, or produces strain. Although strenuous, you keep at it to keep fit, develop muscles or build stamina. The rigours of life are a testament that God, like a gym instructor, is making you go through an unpleasant process that would ultimately pay off for you.
And it doesn't matter whether you think it is God, the enemy, or your carelessness that caused the pain, God will ultimately use it to work out his good pleasure in your life. That tight rope you're walking will work for your good at the end; that loss will deliver a greater reward at the end; that broken trust will be turned around for your good. What the enemy meant for evil, God will turn it around. Don't fret at all that's happening around you, they'd still work for your good.