I’ve noticed a lot of people do this. It seems to be mostly guys.
I just cant seem to keep my legs (particularly the right one) still. Like right now i’m sitting at work and have the ball of my right foot on the ground and my heel and leg bouncing up and down at a rate of probably 3 or 4 bounces a second. Funny thing is, I am totaly relaxed. During concentration or stress it really gets moving. I do this pretty much all day. Even at night while lying in bed I’ll be bouncing my foot in a similar mannor and have to conciously make myself stop. It doesn’t bother me at all, in fact it seems relaxing. It does, however, bother my SO as she doesn’t seem to care for the automatic vibrating couch effect during movies.
BTW I’m nearly 30 and this seems to be something i’ve picked up within the last year or two.
Anybody else experience this or know why it happens??