Play a musical piece that features a hemiola. Ask the students to tap the steady beat as they listen. Explain that the hemiola is a combination of six eighth notes being played against the background of two three-beat notes (duple meter).
Clap the six eighth notes (or two sets of triplets) in the standard hemiola rhythm and have your student imitate you.
Demonstrate the duple meter used along with hemiolas by clapping dotted quarter notes within the same tempo. Ask your students to copy you again.
Divide the class into two groups. Have one group stomp the duple meter on beats one and four. Have the other group clap the six eighth notes.
Repeat the same activity from Step 4, but this time use classroom instruments such as drums, shakers and tambourines.