<iframe src="https://player.vimeo.com/video/277211241?background=1" width="640" height="360" frameborder="0" allowfullscreen></iframe>
Beginning (gram on left) – Walk feet one at a time into chest then walk back out, then walk both feet out to the sides one at a time then back in, keep repeating.
Intermediate (mom in middle) – Just perform a tuck in, driving knees into chest and back out, keep repeating.
Advanced (me on right) – Perform a tuck in and out jumping and then jack feet in and out, keep repeating.