Knuckling

This is a firm but easy stroke made with the fingertips flat on the skin and moving in a rolling motion.
Make your hands into lose fists and place them with the outer side of the fingertips flat on the skin.
Roll them forward, turning them right over so that the knuckles push and slide into the skin.
You can also do the stroke with the palms upwards, lightly rubbing your knuckles across the skin.