Loose-leaf ruled paper, 30 sheets, B5 size

First, just write down the practice routine you did that day.

If that's not enough, try writing down what you were able to do and what you were not able to do.

Well, let's stop now (lol)
It won't last from the start.

By the way, the trick to continuing is to decide when to write.

As soon as I get home after practice.
Before eating.
Before going to bed.
Before taking a bath.

The trick is to open your notebook without thinking too much about what you're going to do, just as you're doing it.

Basically, it's up to you, but the idea is to decide on a location (such as 45 degrees to the right) and record how many of the shots you take there go in.