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World's largest exercise class on Facebook
Kalispell, Mont. (ABC) -- A Montana mom of eight has motivated millions of her closest friends to join her on a quest for a flatter tummy.
Robyn Mendenhall Gardner posted a 30-Day Ab Challenge on Facebook hoping to coax a few other people to join in.
The likes started pouring in right away.
Within a week, nearly one million people were on board with the program.
Now the likes are up to 2.6 million and still climbing.
"I can't come to everyone's home or place of work and make you do these so we all are going to have to work together to try and complete this entire challenge," Gardner wrote in somewhat of an understatement on her Facebook page.
The challenge, which started Sunday and runs through the end of the month, consists of a series of sit-ups, crunches, leg raises and planks, all designed to strengthen the core muscles of the abs, waist and lower back. It sticks to a three-day-on, one-day-off cycle and gets progressively more challenging with each workout.