Now to warm-up the lower range of your voice. You may wish to continue beyond the ranges on the sound clip to suit your voice

Me: Keep the resonance consistent and your mouth shape constant. Engage you diaphragm to ensure each note is sung precisely.

Variation: bring your arms above your head each time the pitch lowers.

Yah: you may wish to use this exercise from Step 1 to warm-up your lower range, focusing on the lower notes.