Johnny Works with Hammer

 Johnny works with one hammer, (1 hammer - 1 fist pounding on knee)

 one hammer, one hammer (2 hammers - 2 fists pounding on knee)

 Johnny works with one hammer (3 hammers - 2 fists 1 foot)

 Then he works with two (4 hammers - 2 fists 2 feet)

(5 hammers - 2 fists, 2 feet and head)

(after 5: “Then he goes to sleep.”)