Christ repeated the fourth commandment in the New Testament many times. Matthew 12, which in Christ is called Lord of the Sabbath instead of ridding it he taught the right view of the Sabbath. The samething in Mark 2, and Luke 6. Hebrews chapter 4 tells us which of the Day of the week it is to be observed (For he who has entered His rest has himself also ceased from his works as God did from His.), which is the first day and it also tells us the there remains a Sabbath Day for the people of God. This passage also tells us that the Sabbath Day is looking forward to our eternal rest when we enter.
So if it is morally binding on all people and in all ages, how should one observe the Sabbath. Isaiah 58 gives us a perfect picture. " If you turn away your foot from the Sabbath, From doing your pleasure on My holy day, And call the Sabbath a delight, The holy day of the LORD honorable, And shall honor Him, not doing your own ways, Nor finding your own pleasure, Nor speaking your own words, Then you shall delight yourself in the LORD;" We are to turn away from doing Our OWN PLEASURES, NOT doing our own ways, NOR speaking our own words, but to delight ourselves in the Lord. That means Corporate Worship. That also means not doing business, not playing sports (pleasure) nor watching sports, not speaking nor thinking our own taughts, but the WHOLE day to be given over to the Worship of the Lord. The Fourth Commandment forbids working on that Holy Day. Neither us nor our servents nor our families. Except what the Lord told us in the gospels for acts of mercy or the Ox in the ditch problem. That means Doctors, Nurses, and Police, etc can work. That does not mean the Doctor should schedule visits on Sunday, but he can save a life in an emergency. The whole Day is the Market Day for the Soul, lets spend it that way.
For those who say but I have to support my family, I understand, I really do. It is so hard in this day and age to support our families, but that does not mean you have to work on Sunday. I have had a good numerous jobs in my life since I was a teenager but I never had to work on Sunday, in being a manager. While I was being hired I always told them I could not work on Sunday and explained why. Most employers understand and they will work with you. Those that don't are breaking the law for deny our religious right, but maybe it is time to find another job that will let you please the Lord.
One last thing, The Scriptures tells us that the Commandments of the Lord is NOT burdensome. That also includes the fourth commandment. It is not burdensome, it really frees us, to worship our Lord and our God with all our heart, soul, and mind. So lets stop trying to make excuses for wanting to do our own ways and our own pleasures and let us serve the Lord.