Feel your body heavy toward earth. Feel gravity.
Imagine that all of the joints are rubbery: toes, ankles, knees, all the way up...
As the music begins, do not think about bouncing; think about pushing into the earth and then feeling the body respond to the energy that pushes back.
Feel the body heavy, as if you are a balloon animal filled with water.
Relax that neck. Let the head bob.