Only on the "CBS This Morning" podcast, David Hallberg, a Principal Dancer with the American Ballet Theatre, talks with CBS News contributor Jamie Wax about his new book, "A Body Of Work." Hallberg discusses how he overcame bullying as a child, has dealt with loneliness and isolation and overcame a near career ending injury. He also talks with Wax about becoming inspired by Fred Astaire as a child, his blinding ambition and being the first American to join the Bolshoi Ballet.