You often have to stand with both arms by your sides not holding on to anything.
It’s just you in space. At first it can seem awkward.
Learn to do it by standing well and easy, with your feet really on the ground, breathing regularly, arms hanging heavy, shoulders down, ribcage holding you up, neck long and head floating above you.
It’s much needed when acting as doctors, lawyers, and cops in TV procedurals. Other roles too. It’s a detailed part of your work.
Practice free standing until it becomes your habit.
Once it is, it becomes a great place from which to unleash your power.