The Viral "Stomach Vacuum" Exercise Actually Works

The hashtag #stomachvacuum already has more than 100 million views on TikTok, but what exactly is the "stomach vacuum" meant to do? Are there safety risks that come with it? Does it actually work?

The "stomach vacuum" isn't a plastic surgery trend, but an abdominal exercise. It is a strengthening move that targets the abdominal muscles, especially the transverse abdominal.

"It’s a biceps curl for your abs," says Dr. Jordan D. Metzl, a Sports Medicine Physician at Hospital for Special Surgery and author of "The Workout Prescription."

Katie Wang, personal trainer and founding instructor for Peloton Row, tells TODAY that the move is nothing new. "They’ve been around for forever," Wang says, explaining that most people have likely done the move without realizing it.

"Any time [yoga and pilates instructors] are saying, 'belly button to the spine,' it’s a version of that stomach vacuum," Wang explains.

There is no major risk in doing the isometric strength move. However, if you have high blood pressure, Wang cautions against doing the "stomach vacuum" as it can cause an increase in blood pressure.

It’s not dangerous, she says, but she does caution people from jumping right in and suggests practicing the move before performing a lengthier "stomach vacuum."

The biggest risk is the misinformation and visuals on TikTok that can take a toll on mental health. For instance, some claim the "stomach vacuum" results in a slimmer waistline and a flatter stomach — this is not really true.

Physical therapist and online coach Jenny Brennecke posts about the move @drjennypt.

Brennecke recommends performing the exercise first thing in the morning on an empty stomach. Her "stomach vacuum" tutorial guides followers through this visual demo:

1. Start by exhaling all of the air out of your lungs.
2. Drive your belly button back toward your spine. Brennecke uses the analogy of walking into a cold lake or pool in order to contract the abdominal muscles.
3. Hold your breath for 10 to 15 seconds, then release.
4. Repeat for five sets; three-four times a week.