“If you mean Sunday, the answer is yes.”
Exodus 20:10, “But the seventh day is the sabbath of the LORD thy God: in it thou shalt not do any work, thou, nor thy son, nor thy daughter, thy manservant, nor thy maidservant, nor thy cattle, nor thy stranger that is within thy gates”.
My hobby, to me, is not work but enjoyment and relaxation and restorative. How is that sin? I go for a walk on sabbath, it is work to walk the hills around my house, is that sin?
What determines what is “work” and what is “rest” or is it personal; how one looks at the activity or the intent?
Work is not defined as something you get paid for. The bible is clear that even the cattle are to observe a day of complete rest; complete (Lev 23:32). Cattle don't get paid! Yet they were to rest to. Furthermore, the Bible says sabbath is to be kept holy. I think this means devoted to God, not to our hobbies. The Bible says one should not even cook on a sabbath let alone mow your grass.