Article continues below advertisementOprah Winfrey celebrated her 72nd birthday in an unconventional yet inspiring way: with a rigorous 72-minute cardio workout. The media mogul took to Instagram on Thursday, January 29, to share a video of herself sweating it out in her home gym.Article continues below advertisementSource: @oprah/InstagramOprah Winfrey celebrated her 72nd birthday with a 72-minute workout.Article continues below advertisement"I never thought I'd spend my birthday doing a workout, let alone a 72-minute one!" she wrote in the post.