It is one of their most current activities, which was recently discovered... that is, to lie flat on their bellies, grab their father's legs while he walks and drags them away.
It does look/sound painful, doesn't it? But it evidently brings joy to the children, you know. I personally think if their father had an extra leg, probably the three of them would be doing this all at the same time, haha. What a pleasant sight THAT would be. Even so, I'm pretty sure it is quite strenuous for the father.
But hey, it can also be good exercise for the legs, right? We can forget about the trouble of having to go to the gym, as we've got our own 'weights' to lift right in the comfort of our own home.
Well, HE can. I need to preserve my legs' energy to run around the house for other chores. Cewah!