Being Fit is so important in the western world today. Our image takes precedent in many situations. The truth is that the the most important "being fit" is being fit for the what God has called you to be.
It's not performance based but rather honor based. Focus on honoring the name of Jesus and being fit with His Word and you WILL become fit for what God has for you!
2 Thessalonians 1 ~ Message Bible
11-12Because we know that this extraordinary day is just ahead, we pray for you all the time—pray that our God will make you fit for what he's called you to be, pray that he'll fill your good ideas and acts of faith with his own energy so that it all amounts to something. If your life honors the name of Jesus, he will honor you. Grace is behind and through all of this, our God giving himself freely, the Master, Jesus Christ, giving himself freely.