If you follow Ashley Graham on social media, you're no stranger to the supermodel's fit-stagrams. Graham constantly posts inspiring videos of her workouts at go-to gym The Dogpound, where she does everything from boxing to strength training.

But some of Graham's followers, or should we say trolls, are constantly hating on her exercise game. On Sunday, the body-positive activist took to Instagram to share a little known secret about her workout posts. 

"EVERYTIME [sic] after I post a workout video I get get [sic] comments like..'You'll never be skinny so stop trying,' 'Don't workout too hard, you'll get skinny,' 'You still need your fat to be a model,' 'Why would you want to loose what made you famous,'" Graham wrote in her post.

In typical Graham fashion, she shut down the haters by explaining her reasons for hitting the gym so hard. None of them have to do with losing weight; instead, "feel good," "get rid of jet lag," and "clear my head" made Graham's list. And the model knows what she's talking about, because research backs up these and other health benefits of exercise.

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To her point about feeling good: a sweat session can boost levels of the hormones endorphins, plus reduce stress and anxiety. A 2014 study also found that hitting the gym can improve memory, since aerobic exercise was linked to an increased hippocampus, the area of the brain that controls memory function. Regular exercise keeps your heart healthy, and as Graham noted, makes your body flexible, which can improve blood circulation. 

While it's totally fine to hit the treadmill or weight rack to slim down, if weight loss isn't your objective, you're hardly alone—you have one of the world's most famous models in your corner.

Hugh Hefner’s cause of death has been listed as cardiac arrest (which also killed Tom Petty just days later) and respiratory failure. But the week before he died on Sept. 27 at age 91, Hefner had an E. coli infection as well as septicemia, or bacteria in the blood, according to his death certificate, PEOPLE reported.

E. coli, or Escherichia coli, bacteria live in our intestines normally, but certain strains can make us sick. Some cause diarrhea, urinary tract infections, pneumonia, and other illnesses, according to the Centers for Disease Control and Prevention. What makes Hefner's E. coli alarming, however, is that his death certificate listed it as resistant to antibiotics. Drug-resistant E. coli is particularly troubling because public health officials are running out of ways to treat such infections. “There are some infections that we see that are so resistant to antibiotics, we wouldn’t predict that any antibiotic would be able to work,” says Pritish K. Tosh, MD, a Mayo Clinic infectious disease physician and researcher.

Most people with an E. coli infection in the gut, which would cause diarrhea, get better after a few days of rest and extra fluids to prevent dehydration. But more serious E. coli infections may require antibiotics and could be life-threatening, says Dr. Tosh, especially if first-line antibiotics are not effective. (Dr. Tosh did not treat Hefner.) When E. Coli doesn’t respond to treatment, doctors might use older antibiotics, but those can be less effective and more toxic, he says.

RELATED: 5 Ways to Tell if You Need an Antibiotic

Think of antibiotic resistance as a survival mechanism for bacteria, Dr. Tosh explains. Bacteria developed resistance over time to drugs designed to kill them off so they could keep multiplying. But humans may be making it easier for these so-called superbugs to thrive—in part by taking more antibiotics than we need and not using them as recommended by doctors. “The more antibiotics we use, the more pressure there is on bacteria to survive,” he says. “If we aren’t taking conscious steps, we will find ourselves back in the pre-antibiotic era."

Thankfully, cases of antibiotic-resistant E. coli infections are rare, says Dr. Tosh. The bacteria, which are usually spread through contaminated food, water, or from person to person, first set up shop in the gut. In most healthy people, good gut bacteria keep the bad ones in check. But if you’re already sick or your immune system is compromised, taking antibiotics will reduce your levels of healthy gut bacteria and give drug-resistant bacteria a greater chance of surviving, thriving, and triggering serious illness, he explains.

The cause of Hefner’s E. coli infection was listed on his death certificate as unknown, according to PEOPLE. He also had septicemia, or bacteria in his blood…

Jennifer Garner has the formula, but she forgot one obvious ingredient: hard work!

The 45-year-old actress shared a video to Instagram documenting her extreme workout routine, which she dubbed the “Recipe for Turning A Mom Back into Action Lady.”

The remedy called for an hour workout with Body by Simone, 90 minutes of “stunt team,” 50 cups of coffee and three minutes of cryotherapy every day. For her pump-up playlist, Garner set the footage to “Canned Heat” by Jamiroquai.

“Good luck everybody!” she wished her followers.

Garner did not specify why she was kicking her fitness up a notch, but perhaps it’s for a starring role in the action film Peppermint, which Deadline describes as “John Wick, with a female protagonist.”

And all this focus on fitness comes on top of being a mom. Garner has three kids — Violet, 11, Seraphina, 8 and Samuel, 5 — with Ben Affleck. The duo broke off their 10-year marriage in June of 2015 and officially filed for divorce in April.

The actress recently posted a sleepy, makeup-free selfie from the inside of a tent, announcing that she was in the midst of a “Yes Day” — a family tradition in which the parents indulge all their kids wishes (within reason). This is the fifth year Garner has celebrated the unofficial holiday.

“You’ll never need coffee more than the day after ‘Yes Day!’ ” she captioned on Instagram. Along with a series of hashtags explaining that she and the kids had slept in a tent in the backyard. She added that “coffee” is her “Yes Day.”