One of the many things that Matthew enjoys is playing outside, especially in 70 - 85°F weather. Something else he enjoys is music. I like songs that get him listening, thinking and moving. In this video, he demonstrates the Hokey Pokey with his shadow.
He doesn't know his right from his left yet but he knows where his arms, elbow, hands, fingers, legs, knees, feet and toes are. He also knows other body parts like nose, eyes, chin, hair, head, ears, mouth, tongue, teeth, chin, cheeks, shoulders, tummy, belly button and neck but they're not easy to incorporate into the Hokey Pokey.
We used the song "If you're happy and you know it" to teach him body parts. It also worked well during fussy diaper changes (and it still does sometimes.)