Regarding Standing Practice: One of Shioda's uchi-deshi recently published an account of his training at
http://www.yoshinkan.info/deshi.php
"The training in this course consists of three parts starting from basic movements. The basic movements are like "Kata" in Karate which can train the physical strength of legs and groin necessary for Aikido techniques. In the basic movements you must stand with 80 percent of your body weight rested on one leg for about five minutes moving both left and right with different movements."
Best
Ellis Amdur