In tree pose, I'll often send my 'roots' down into the floor, the 'earth', and feel the affect this has on me - structurally, emotionally, etc. It's amazingly peaceful and having established a firm foundation, deep roots allow for freedom of flexibility in the 'trunk' and 'branches'.
In mountain pose, I embrace the solidness of my structure and support from the 'earth' which provides me a base from which to support other living beings.
And, in meditation, I'll sometimes view my mind as a lake. As fluctuations (thoughts) 'ripple' across the surface, beneath there remains an immense calm and clear stillness.
Like a tree, I am rooted, balanced, and in harmony.
Like a mountain, I am strong, stable, and supportive.
Like a lake, underneath the ripples I am calm, clear, and deep.