God commanded us to work 6 days, and then on the seventh day rest. You are not to do any work on the Sabbath, nor travel no more than a stones throw from your home on the Sabbath. So, because God mandated these things to you, you observe these things strictly, don't you?
By the way, God didn't prescribe driving a car, having a refrigerator, watching tv, going to movies, etc. either.
God said that "Thou shalt love the LORD thy God with all, your hear, with all your soul, with all your strength, and with all your mind, and love thy neighbor as yourself. He also said that if someone strikes you on one cheek, turn to him the other also, and if a person forces you to walk a mile with him, walk an additional mile with him also, and if some one takes your shirt, offer him your jacket as well. And since you would not want to do something that God did not propose, YOU would definitely NOT want to offend God by NOT OBEYING ALL OF HIS COMMANDMENTS WOULD YOU?