Yes it is possible.
You can understand it as advance form of Reiki and telepathy. Using Power of Mind. I don't know much about Shri Sathya Sai Baba or any one who claims to possess such powers. But, Energy of body can be controlled. E.G if you go to any spiritual place with full devotion, You will feel change in your body temperature, Energy Level of Your Body, Your Thought Patters (It won't be normal either fully calm down or very aggressive).
But, one more thing, If any one really hold such powers, not to expose for any Material Gain or otherwise unless there is highly divine purpose.
Transformation of Power, Usually it is done when Master wants to advance spiritual level of his disciple to prepare him/her to take his place at the time of departing from their Material (Human) Form or to end or balance the Gap needed to perform certain spiritual tasks in future.
It is only my opinion based on my limited knowledge and not personal experience. Reality May Differ.
May Sai Bless You!
om sri sai ram!