Picking up a "boring hobby" usually works. But do take note that nowadays many activities that used to be more male-oriented are also being taken up by women. For instance, a lot of women cycle and go hiking.
For me, quite heng because as a kid, I like to play chinese chess (the real one). So I supposesedly spend a lot of time in the "library" reading up on chess moves and also going to parks and finding old people to play with.
