Every Christian must have a desire to grow spiritually and make this a priority in their faith walk.
When it comes to faith and relationship with God, there is no such thing as standing still hence why it is called the Faith Walk. Either you are moving forward and developing more Christ-like characteristics or you are moving backwards and walking more in the flesh nature.
So if backsliding is walking in the flesh, the opposite is walking in the Spirit.
A more basic way to put it is: your spiritual growth is relative to the YIELDING and WALKING in accordance to the WORD of God.
Following after righteousness, being transformed by the renewing of your mind, perfecting holiness in the fear of God and many more disciplines are outlined in the bible for us all.