In the clip, the 35-year-old walked along the water wearing a teal and white polka dot crop top, white bikini bottoms and an ivory sun hat. She filmed herself playfully performing to a voice over that said, "Suck it in ... I'm not sucking it in! ... Why? ... Real stomach is coming back, OK?"
"Have you ever been told to do this? When I was younger I always heard this — and I wasn't even fat," she captioned the video. "It gave me a complex about my body and made me overthink what I'd eat, the size of my clothes, how much I exercised — and I was only like 115 to 120 lbs [52 to 54 kg]."
"So for those of you who say 'but you aren't even big,' the size of someone's body doesn't mean anything about how they feel about it. Or what they're told about it," the reality star continued. "Gone are the days I'm gonna hide behind a towel or not even go swimming because I don't think I'm skinny enough."
Otis concluded her post with a powerful reminder to let go of negative thoughts surrounding our bodies.
"That period of life is over for me. I'm breaking that cycle for me and for my babies. I hope by sharing these 'body love/body [positive]' messages every week or so it helps encourage others to break that cycle too, because man, it is toxic," she wrote.
Fans loved the inspirational post, praising Otis for her transparency and vulnerability.
"Love this vulnerable video! Live your life as you are because you are loved and you are enough!" commented a fan.
"I really needed this reminder. I spent most of my teens years battling with body image issues and I still struggle," someone else admitted. "This is so important for so many people, and these posts are changing lives!"
"This is so real and I truly appreciate how open you are on social media. We need to enjoy life and not care what people think!" wrote another.