To sign skate, turn your palms upward and curve both index fingers while the rest of your fingers are curled in, mimicking the blades of ice skates. Then move both hands at the same time, making side-to-side arcs as in a skating motion.
If you want to make the sign for roller skates, on the other hand, then curve both the index and middle fingers of each hand, hold them facing up, then make the same side-to-side arcs as in a skating motion, this time suggesting the two sets of skate wheels per foot.
We use the sign for skate when we first introduce our toddler to basic skating skills.
Skating is an advanced motor skill more suitable for toddlers. We teach our little ones the sign for skate in association to older siblings skating, or when we first introduce them to the basics of skating.