When we use our bodies physically for the purpose of increasing strength, we often apply resistance. That resistance may come in the form of an object, gravitational position, another person or a particular muscular engagement.
As we experience resistance emotionally and mentally, we also may strengthen our commitment and perseverance. Similarly resistance to spiritual practices may strengthen our connection to Spirit as long as we continue with practicing anyway.
What would you like to strengthen? What resistance may help with that? Ki to Happiness feels the resistance and continues to strengthen in body, mind, emotions and spirit.