Yang Family Tai Chi Discussion Board

Upon reading the latest members magazine, winter/spring edition, I came across an article mentioning some practice exercises. The names of the exercises are "Rowing the Boat" and "Cat Walk". Can someone please explain how to perform such exercises?
Plus, if there are some other developmental exercises for balance and strength in Tai Chi, please suggest.

This is a good example of "cat walk" or Tai Chi walk:
https://video.search.yahoo.com/yhs/sear ... ction=view

This is a good example of an improper way to do the Tai Chi walk:
https://video.search.yahoo.com/yhs/sear ... ction=view