Conversation so far:
What was DDP Yoga by Diamond Dallas Page?
Diamond Dallas Page developed the book Yoga for Regular Guys into a series of workout videos titled DDP YOGA.
Was DDP YOGA Diamond Dallas Page's fitness program?
DDP YOGA is a series of workout videos.
Did Diamond Dallas Page promote DDP YOGA to the public?
DDP Yoga was featured in a video about Arthur Boorman in May 2012. The story was picked up by the mainstream media, including Good Morning America.

Question: How well were the book sales?
Self-contained rewrite: How well were Diamond Dallas Page's book sales?