Our bodies are vessels through which we do our holy work in this world. We need to make the appropriate hishtadlus to ensure that we keep our bodies at their optimum level. Before falling asleep ask Hashem that your mind and body receive the rest they require to keep you mentally focused and emotionally balanced. While exercising focus on increasing your strength and improving your health to be able to accomplish your tafkid. While eating a mouthful of food, meditate on elevating the spiritual energy contained within. With these simple kavanos (intentions) we infuse our actions with meaning and kedusha.