Macy's Day Parade Balloons. Helium is lighter than air.
Fill your leg bones with helium. Now pelvis, spine, arm bones, head.....So much helium that your body thinks up, floats up, and is now a large Macy's Day Parade balloon hovering over the crowds below. Slow and steady, moved by the faintest wind.
Just for fun try thinking whole body down...then think up...feel the difference thinking can make?