Urdhva Prasarita Padasana
This is a gentle movement with the breath. It is interesting how repetitive movements like this, where you are linking the movement with the breath really do far more than you might realize just by looking at it. One of the secrets to a movement like this is that the movement is really synched up with the breath in a way where the breath starts first and the breath finishes after the movement so that the breath envelops the movement. That takes a lot of concentration. Another aspect of this is the way in which you are breathing. If you are inhaling into the chest first while keeping the lower part of the abdomen gently pulled inward a little, the breath while help your body move and cause the movement to be initiated by the breath and the core. This will actually help you improve your movement mechanics in ways that you would not even expect. My experience has been that, as a result of doing movements like this where I am focused on simple, clean movement mechanics and connecting the movements with the breath, it makes it much easier for me to to do many of those more complex looking movements like the floats, because movements like these teach your body how to move with control. These seemingly simple movements are truly well worth taking the time to work on.