It is very hard to keep one's foot from turning away from the Sabbath. The use of the word "labor" is quite appropriate.
It's certainly not easy believism. However, as Christ said, his burden is light and his yoke is easy.
Mat 11:28 Come unto me, all ye that labor and are heavy laden, and I will give you rest.
Mat 11:29 Take my yoke upon you, and learn of me; for I am meek and lowly in heart: and ye shall find rest unto your souls.
Mat 11:30 For my yoke is easy, and my burden is light.
If we let Christ live in and through us and just do his will instead of fighting it, then it is easy.