There are many reasons for Christians to honor and respect the physical nature God has endowed them with. Rather than disdain the body Christians should honor their physical natures and offer thanks to God for creating us as corporeal beings rather than spirits for the following reasons.
1. Christ became flesh. Had Christ not taken on flesh, no human flesh could enter heaven. Because Christ took on flesh, becoming God incarnate, our salvation is purchased. Flesh is so central to the work of Christ that Scripture warns us denial of Christ's flesh is rejection of Christ's work.
1 John 4:2 By this you know the Spirit of God: every spirit that confesses that Jesus Christ has come in the flesh is from God.
2. Scripture tells us the body should be nourished and cherished just as Christ loves His Church.
Ephesians 5:28-29 In the same way husbands should love their wives as their own bodies. He who loves his wife loves himself. For no one ever hated his own flesh, but nourishes and cherishes it, just as Christ does the church.
3. The one-flesh union of man and wife was given mankind by God to serve as the source of our greatest earthly help and comfort. Without our physical bodies there would be no marriage, no sexual union, no children. God has blessed us in a manner denied the angels by permitting us bodies with which we may take part in the wonder of procreation. Isaac went into his mother's tent with Rebecca and was comforted there in the loss of his mother by the body of his wife.
4. Without the body how much less joyful life would be. No feasting. No ice cream! No back rubs! No body surfing! No exhaustion! No rest!
5. Without the body, the sacraments could not exist.
6. Though "the flesh" often stands for the sinfulness of this world in Scripture, one of Scripture's great promises is that God will give hearts of flesh in place of hearts of stone to those whom He loves.
Ezekiel 36:26 And I will give you a new heart, and a new spirit I will put within you. And I will remove the heart of stone from your flesh and give you a heart of flesh.
7. The Bible promises us that through acting on the flesh God influences and cleanses the spirit.
1 Peter 4:1 Since therefore Christ suffered in the flesh, arm yourselves with the same way of thinking, for whoever has suffered in the flesh has ceased from sin.
Those who disdain the physical significance of the sacraments rarely speak against the value of suffering in the flesh. Yet isn't the promise of spiritual fruit from physical deeds of 1 Peter 4:1 similar in principle to the promises attached to baptism and the Lord's Supper?