Is this a good way of being certain that something is done every other day?

The problem is that sometimes I forget whether I did something the day before.

I could have a piece of paper on the refrigerator and draw a circle starting on the off day and draw a line through the circle when the activity is done on the following day,

I thought that a better approach was to reason as follows: If I start by doing the activity on a Sunday, then it will be done on Sunday, Tuesday, Thursday and Saturday. The following week it will be done Monday, Wednesday and Friday. All I have to do is know what type of week it is and know the current day of the week. I could have a piece of paper on the fridge telling what type of week it currently is, which would be updated at the end of the week, either Saturday or Friday.