The 27-year-old champion shared the video to his Instagram stories before 8 a.m. this morning. In the video, a man can be seen reading through a list of questions which Joshua was expected to supply answers to.
One questions asked was: "Has the athlete performed altitude simulation in the last two weeks?"
Another question was: "Has the athlete donated blood in the last three months?"
Joshua remained calm as he responded "No" to both questions. He shared the video with the caption:
"Drug testers knocking early doors".