@daniel_bohrer It's a good question, and it's a bit arbitrary, to be honest: 64 kg correspond to a BMI of 20 for me, which lies in the middle of the "normal weight" range.

And in 2022 I decided that would be an exciting goal to shoot for. A 3 kg band on top of that seemed reasonable to allow ups and downs.

When I reached it, it felt and looked good, so I stuck with it. That's it, really :)