Sequencing -- The arm balances are advanced warm up poses. They are closely related to the standing warm up poses. Take a look at arm balances you are working on in class. Each one contains the actions of the plank pose and the low plank. Look at what is going on at the hips, in the pelvic girdle. Does the arm balance look like a triangle married with the plank or low plank? Does it look like the single pigeon married with the plank or low plank? The standing warm up poses produce tapas, helping us to train the mind to concentrate, and also help us to warm the body up for the deeper practices. When you are an advanced student the arm balances do the same thing for you.