In the UK, everyone must drive or ride on the left side of the roadway. It is important to never ride your bike against the flow of the traffic. You do not need to use cycling lanes but they can make your journey safer.
Cycling mainly exercises the larger muscle groups of the lower body, such as the front thighs, back thighs and calves - but also the trunk. Unlike running, for example, cycling is much gentler on muscles and joints, which makes it an excellent form of exercise for the body, as well as being a good transport option.
Although debated, there is no law in the UK requiring cyclists to wear a helmet, although they are recommended to be worn by the Highway Code.