Stand facing a counter with your upper arms
close to your body, your elbows at approximately
90 degrees of flexion, and your forearms pronated,
placing your hands palm-down on the countertop.
keeping your hands in contact with the surface of
the countertop, slide your palms on the countertop:

• away from the midline of your body.
• toward the midline of your body.

a. what motion did you perform when your palms
moved away from the midline of your body?

b. what motion did you perform when your palms
moved toward the midline of your body?

c. in what plane were you moving?

d. what is the axis for that plane?