When you walk into Rebel Fitness Club, a new boxing-oriented gym outside of Detroit, Michigan, you’re greeted by a sign declaring the space’s zero-tolerance policy for harassment, violence and abuse. Continue down the halls and you’ll find bold phrases on the walls like “rebel against hate” and “rebel against bullying." Take a group class or a one-on-training and you’ll notice that aside from a corrective tap on the shoulder or elbow (and a high-five to close), trainers do not touch you at all. The rooms where classes are held are so dimly lit you can’t get a good look at yourself, let alone at your classmates and there’s only one mirror in the front of the room.

This is what goes into making a gym a safe, comfortable space for all members, but especially for women, says owner Michelle Landry who has experienced harassment firsthand in other gyms.

Women often alter their workout regimen to end harassment

“Working out in gyms became super uncomfortable for me,” Landry tells NBC News BETTER, adding that she opened Rebel with the intention of appealing to others who may be in the same boat. “There were always creepy men leering no matter what. I started to wear this ‘get away from me’ expression just to avoid it, but that’s not a real solution. Women shouldn’t have to change their behaviors to prevent unwanted interactions.”

And yet, as a new survey by ExerciseBike.net found, many women are doing just that: changing their behaviors to deal with sexual harassment in the gym. Consulting 1,000 adults (roughly split between men and women), the survey found that 18.5 percent of women had a negative experience at the gym, most of whom altered their workout regimen in response: 72 percent of women wore different clothes to work out after being sexually harassed at the gym; 48 percent stopped doing certain exercises, 37 percent switched gyms or stopped going altogether and 79 percent said they’d consider an all-women’s gym to prevent sexual harassment.

“I think these percentages are shocking,” says Meg Piedmont, a senior account manager at Fractl, who helped oversee the survey. “And they’re also emotionally impactful, especially with the current climate we have [amid #Metoo and #Timesup]. It’s just shocking to see that this is happening so much in the gym.”

Men are targeted too, but victims are predominantly women

The survey found that men are also victims of sexual harassment in the gym, though the number (still startling) is smaller: 7.3 percent of men said they had been sexually harassed in the gym. They too fight back, however unfairly, by changing their ways but are, based on this survey at least, less inclined to do so than women. Twenty-five percent of men who had been sexually harassed wore different clothing after, 31 percent have stopped doing certain exercises, 17 percent have switched gyms or stopped going altogether and 31 percent said they would consider joining an all-men’s gym.

Men may be sexually harassed less than women in gyms (a micro-reflection of society at large, perhaps), but there’s a clear crossing of boundaries regardless of one’s gender, and most of the time (93 percent) the offense is committed by a fellow gym member and most victims (98 percent of women victims and 95 percent of men) cited touching or groping as the offense, followed by “being rubbed up against” (92 percent of women and 85 percent of men). Additionally, both men and women are wary to report incidents: 44 percent of women “did nothing” following harassment as did 67 percent of men.

Bullying, shaming and ‘splaining

This survey focuses on sexual harassment, but gyms also seem to be cesspools for all kinds of harassment, including body shaming.

“I've been a gym regular for about 7 years,” says Ma’Chell Duma, an author, editor and branding consultant in her early forties. “I spent most of my life ill with [Polycystic Ovary Syndrome], a disease that doesn't give you much control over your weight or body. After my hysterectomy, I began exercising with positive results. My body had never been thin, always at best ‘thick’ but I am very fit. My first gym in Seattle had a women's only section [where] two women stood behind me and talked about how they'd die if they were my size (18, then) because they thought I couldn't hear them through my headphones.”

Duma says she also receives troves of unsolicited comments from fellow gym members about when or how she should work out. She also hears “you’re brave” a lot — “just for exercising,” she adds.

Lauren Saccone, a freelance writer and social media specialist in her early thirties has also had her overwhelming share of despicable experiences at the gym, especially when she’s lifting weights.

“I’ve had men take my headphones off while I’m working to tell me I must be in the wrong area,” Saccone says. “I’ve been challenged on my abilities while lifting, and I’ve had men make disparaging comments about my ‘inappropriate’ attire (a tank top and sweat pants). My favorite was when a guy came up to me and said, ‘I have something heavy you can lift.’ I know this was a euphemism, but I hope I never find out what he meant.”

Don’t use the gym for flirting. Just don’t.

Why do gyms act as virtual cesspools for lewd and unwanted behavior? Why in particular do men somehow think they can get away with or even be appreciated for sexually charged gestures or remarks? The list of reasons could go on and may include, as Jessica Higgins an avid fitness fan and the author of the forthcoming book “The 12 Essential Business Communication Skills”, the warped idea that gyms are a good place to mingle and meet potential dates.

“I’m not exactly sure why so many men’s magazines reported that the gym is a great place to meet women, but coming from my female workout friends: we dissent,” says Higgins. “If you run into us before or after a workout, that’s totally fine. But detracting someone else’s focus from their fitness is depriving them of their time and energy. Give us space.”

Same goes for those eyeing men they may be interested in. Save it for the bar.