Check out our fave hot yoga classes in LondonTOM & FRANZISKA WERNER - Getty Images

When it comes to yoga, there are so many different types (from vinyasa flows to a soothing yin class). But our favourite, especially on the days we want a real challenge? Hot yoga.

But, err, what exactly is hot yoga? And where are the best hot yoga classes to try in London?

We asked expert instructor Penelope Oldfield, Head of Yoga and Pilates at Virgin Active, for the 411 and give a shoutout to our fave tried and tested classes. Namaste!

Much like the name suggests, it's a type of yoga practice that takes place in a heated environment (typically ranging from 32 to 40c) "The exact temperature can vary depending on the specific type of hot yoga class and the preferences of the instructor or studio," explains Oldfield.

The addition of heat is said to "enhance flexibility in the muscles and joints, boost circulation, and promote detoxification through perspiration. Because the heat warms up the muscles, it allows participants to enhance their flexibility, by going deeper into their poses" says Oldfield. She also believes hot yoga helps to "detoxify the body by draining out toxins and impurities via the skin". Because the heat increases your heart rate, it may also help to improve your cardiovascular health and endurance.

It can help on the mental front, too. "Hot yoga helps achieve mental clarity and concentration, requiring participants to concentrate on their breath and movements in the heat. This facilitates a sense of awareness and provides a means of relieving stress." When done consistently, Oldfield adds, it has "the potential to enhance total physical strength, balance, flexibility, and mental well-being, making it a well-rounded exercise choice".

Bikram is a specific style of hot yoga, says Oldfield, and the most known one at that. "It was created by Bikram Choudhury in the early 1970s and comprises of 26 postures," she notes. "Bikram Yoga is frequently done in a standardised fashion, with each class following a set schedule."

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Something that lets the body breathe, baby! "Choose breathable, sweat-wicking textiles to effectively control sweat and keep you dry," advises Oldfield. "Lightweight, breathable clothing, such as shorts or vest tops, allow for maximum ventilation and flexibility during the practice. It's best to pack a change of clothes too, for the trip to and from the studio."

Sadly not, explains Oldfield. "Some people should exercise with care or avoid it entirely," she says. "Pregnant women should typically avoid hot yoga because the increase in body temperature and heart rate may cause complications.

"It is also advisable that individuals with cardiovascular concerns or respiratory problems should see their doctor before doing hot yoga."

This friendly and affordable studio in the heart of Soho doesn't just offer one type of hot yoga, it has seven to choose from: hot dharma, hot vinyasa flow, hot yin yoga, hot yang yin, hot rocket yoga, hot power flow and last but not least... hot power to restore.

Our tester went along to a hot vinyasa flow class and found the teacher was both supportive and clear in their instructions, offering multiple adaptions for each pose too. Okay, so the facility isn't super glossy or high-end (it's inside a leisure centre) but that's why it's so affordable. Plus, there's still lockers, toilets, showers and anything else you might need.

If you work in central London and want an affordable class after office hours, or even on your lunch break, then MoreYoga certainly comes with our seal of approval.

MoreYoga Soho costs 39 a month for unlimited classes, or you can book a one-off class via ClassPass. There is also a MoreYoga studio in Victoria.

Despite being set just a stone's throw away from Oxford Street, Virgin Active in Mayfair is surprisingly spacious our tester remarked that the site feels like a TARDIS. She also noted that the gym has a wide array of classes including reformer Pilates and boxing, but that hot yoga proved to be one of the most popular (and for good reason).

Her hot yoga class was led by Simon Avis, who she found to be both supportive and knowledgeable. Overall, she says, Virgin Active Mayfair provided not only a challenging physical workout but also a relaxing and revitalising experience. She also praised Simon's "excellent music selection and the overall atmosphere" created within his class.

Elsewhere on site, you can expect top-notch facilities such as a fully equipped gym floor, swimming pool, steam room and jacuzzi perfect for unwinding in post-workout.

A membership to Virgin Active in Mayfair (including classes) costs 189 p/m.

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