Inside the toxic world of dance training: Pros reveal how Strictly stars like Graziano go through brutal initiations with 'bully' teachers who encourage 'concentration camp' thinness and 'perform on broken bones'

WARNING: GRAPHIC IMAGES. Graziano Di Prima, 30, was axed from the show over reports he verbally and physically abused his celeb partner Zara McDermott during last year's series.