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The American Council on Exercise (ACE) published a 2015 study that raised concerns about Bikram yoga.

During a 90-minute class, body temperature rose consistently in healthy participants experienced in hot yoga, the study found. The participants’ temperatures topped out at 103 degrees, narrowly missing the 104-degree threshold that doctors consider dangerous.

“For a person who’s unfit or not used to Bikram, there’s some [concern] that they might experience some level of heat intolerance,” said Cedric Bryant, PhD, chief science officer at ACE.

ACE recommends that newcomers stick to conventional yoga or try hot yoga at a studio that offers it at lower heat.

An earlier ACE study published in 2013 found that hot yoga classes at lower temperatures do not pose a risk. But all hot yoga participants should lie down or leave the room if they feel nauseous, light-headed, or confused in a class.

“You do want to use some common sense if you’re feeling out of sorts,” Bryant said.

Allison Abel Rissel — a North Dakota yoga instructor who published research on the health benefits of hot yoga as part of her graduate training in exercise physiology — agreed.

“It is hot in that room, but as long as you’re properly hydrated, I think it’s a manageable heat,” she told Healthline in 2015.

But, according to Mindy Caplan, a yoga instructor and a health fitness specialist certified through the American College of Sports Medicine, many participants don’t ease in to the higher temperatures.

“Groupon’s out there saying you can try hot yoga, and it’s usually somebody that’s never practiced yoga before and they go in there,” she told Healthline in 2015. “They’re not well hydrated. They’re not in shape.”

Caplan briefly tried Bikram and doesn’t recommend it for students.

Pregnant women and people with diabetes or any sort of cardiovascular problem, including high blood pressure, should avoid hot yoga, according to recommendations from ACE and Canadian health groups.

Rissel said she’s seen pregnant women in hot yoga classes, but they were acclimated because “they’d been doing it for years.”

People with preexisting health conditions should talk to their doctor before beginning a hot yoga program to make sure they aren’t at a higher risk for complications.

When taking a hot yoga class, it’s also important to pay close attention to the way your body’s feeling.

Healthline’s medical network advises anyone who experiences adverse effects while in a hot yoga class to leave immediately and seek medical care.