There are different ways you can practice the active excercises. You might want to try some of those same motions sitting or lying down. Summer is also coming, and in the water is a great place to practice if you have major balance problems.
Doing excercises like this cause a lot of internal changes. A lot of your larger muscle groups need to relax enough to allow deeper muscles, tendons, ligaments and the like to take more of the strain. This kind of change takes time, so if it's too much for you right now, try a less strenuous version of it. Allow your body to change.
