Drive your foot down to the ground, generating a double foot contact as you raise your opposite foot and knee. (coreperformance.com)
For people completely new or overweight, foot contacts per session need to be kept to a minimum. (fitnessdoctrine.com)
The principle behind the laser shoes is simple: upon foot contact, the left shoe projects a line on the floor in front of the right foot. (sciencedaily.com)