It is the discipline of being with God. We can also simplify our eating habits. God might lead us to eat out less and share that money with a food pantry. Invite God to lead you down the path of simplicity. Don't do it by your own effort.
Submission is the discipline of letting go.
It is giving God control of our lives and willingly obeying whatever He calls us to do, whether that obedience is to keep quiet when we think we have the answer or forgiving someone who hurt us. Service as a spiritual discipline can be so rewarding. By humbly serving, we won't need to be recognized. In fact, we will yearn to be anonymous because our service becomes a privileged opportunity to participate with God in His work. My son Benjamin's voice says, You should be helping me write my name, learn the alphabet, numbers, shapes and colors.