It is said that Sunday is a day of rest. The saying comes from the book of Genesis when scripture says that God rested on the seventh day.
Rest is good. From whatever we do in this life, it is good to take a break, to rest from the normal routine, the stress and demands of the day.
So, whether it be Sunday or whatever day you choose, find rest for your body and soul. Give yourself a chance to revive from the stress of each day.