Make Your Own Poses

I only use original sims 3(This is hard)

Make your child sims run on any room and pause(Let another 2 sims sing to imaginary friend in sametime)
Go to buy mode, moveobjects on(testingcheatsenabled true). Move 2 sims to the sims are running(like their legs)(Press Alt while moving)

*I call it Original/Your Own Poses* Created by The Sims 3 (Generations) and
Me

DO IT YOUR OWN IF YOU WANT SO :D