Shabbat (the Sabbath day) is mandated by God. Yes! You have to do it! And, no, you can't just pick any day of the week and say, "I choose today to be my Shabbat". From Friday sun down to Saturday sun down we are supposed to stop working. To rest.
Consider with your husband how this could be a practical part of your family life. You could plan to cook everything ahead of time, weekly chores could be done on Fridays. How about a four day school week to accomplish that? A sweet friend of mine says that they always have dessert on Shabbat. I am sure all of her children look forward to it!
Check out what the other Jenny M - another sister in the Lord I've met online, has to say about why she loves to fulfill God's commandment.
Enjoy your Shabbat today. Focus your efforts on the spiritual instead of the carnal. Look to Him today.