Here's a little egg, so smooth and white
Peck, peck, peck, there's something inside
Peck, peck, peck, here comes a little beak
Peck, peck, peck, here come two little feet
Peck, peck, peck and pick, pick, pick
And crack, crack CRACK!
Out pops the baby chick!
A favorite despite my inability to remember the words, no matter how many times we do it.
Start by crouching in a ball on the floor. As you say the rhyme, slowly get up until on the last "crack" you leap up and wave your arms.