I'm on the floor with them, or they're chasing me around the house. They love it if I do yoga, any posture where they can go under me is fun. When I come home from work, the first thing I do is kneel down on the floor, and I get head butts and kisses. They are worth all the trouble they cause. 
One thing I did when Eddy was a kitten, was put all his toys in an old Kleenex box, so he'd have to spend time getting them out. I needed some way of slowing him down, so I could take a break (he was CRAZY). I've never had 2 kittens at once, so maybe they'll keep each other busy. Actually, it did get easier with Eddy when we got Twiggy.
'02 Eddy Merckx Fuga, Selle An Atomica
'85 Eddy Merckx Professional, Selle An Atomica
'10 Soma Double Cross DC, Selle An Atomica
Slacker on wheels.