To many people, the word yoga conjures up the image of a long-haired, bearded Indian man sitting in the lotus position and chanting. It has been increasingly in the public eye, helped by celebrities such as Madonna, Geri Halliwell and Gwyneth Paltrow singing its praises.

Reported improvements such as toned upper arms, trim stomach and firm thighs and bums have encouraged them to take up yoga, but for the uninitiated and uninformed, what is it all about? Yoga originated in India around 6,000 years ago. The practice sometimes seems to have an air of mystery about it, which perhaps prevents many people from trying a class. It can be seen as new-age, 'alternative' or a bit of a fad in the exercise world. In reality it is a holistic practice that benefits body, mind and spirit.

People take up yoga for a surprisingly wide range of reasons: to gain flexibility, to tone-up or lose weight, to improve their ability to relax or to prepare their body for a physical event such as childbirth. Regular practice of yoga will improve your general fitness and body shape, make you stronger, calmer and more able to cope with the stresses and strains of life. Types of Hatha (or physical) yoga is broken down into eight stages or limbs.

Traditionally these are followed progressively to reach Samadhi, the last stage, where the spirit is liberated and becomes 'at one' with the universe. Yoga practised in the west mainly encapsulates stages three and four. Stage three (Asana) is the practise of the postures or poses and stage four (Pranayama) is rhythmic control of the breath.

There are many styles of Hatha yoga currently being taught, all of which have slightly different emphases.

• Astanga yoga is the form of yoga currently enjoying the most attention. Also known as power yoga, the moves or transitions between asanas are performed at a higher speed than usual, thus providing an aerobic workout, missing in the alternative yoga forms.
• Iyengar yoga, based on the teachings of BKS Iyengar from Pune, India, concentrates on the postural alignment of the body and limbs. The practice makes use of ropes, blocks and belts to aid in the attainment of the asanas.
• Sivananda yoga focuses on the flow of energy in the spine. This style is built around a specific sequence of twelve postures or poses.

What to look for in a yoga class

Yoga includes elements such as stretching, balancing and posturing - the combination of which can seem like a contortionist act to the newcomer. However, a good yoga teacher will tailor the postures to suit the different abilities within a class. Some classes will focus heavily on meditation and visualisation, but for others, meditation simply refers to the period of cool-down or relaxation at the end of the session. Controlled breathing is a hugely important part of the practice.

Yoga is suitable for both men and women and can be enjoyed by the full range of fitness abilities. Even if you have trouble touching your toes, yoga can still be open to you. Classes can be found by looking in the telephone book or by recommendation from friends or work colleagues.

There are numerous teachers in the larger cities and a few are listed below. Try out one or two sessions before committing yourself to a lengthy course, as your relationship with your yoga teacher is one of the most important factors in your enjoyment and progress of yoga.

Where to do yoga in the UK

There is a wealth of online yoga resources specifically for the UK, include listings of classes and teachers by area. The Yoga Pages offer directories of teachers, classes and retreats. Yoga Village UK has lists of teachers and yoga holidays, as well as a yoga events diary, while yoga.co.uk lists classes, holidays and events. The British Wheel of Yoga site allows you to search for local teachers by postcode.

With so many options, you'll be spoiled for choice! Why not ask locals or other expats in your area for recommendations? If you don't know any yoga-goers, you can always try asking in the Expatica Forums.