When you go out on a bike ride do you always wear a helmet?
In the UK, wearing a helmet isn't the law and apparently only one in five people put one on before going for a ride.
Olympic rowing champion James Cracknell doesn't think that enough people are protecting their heads before getting on their bikes.
He told Ricky about a new cycle safety campaign that he's supporting.
Last year, James was almost killed when a lorry hit him while he was cycling across America.
Doctors have said that if he hadn't been wearing a helmet he'd have died.
In Australia and New Zealand it's against the law get on a bike without one and some people want it to be the same here.
But not everyone agrees, a few groups think that by making everyone wear a helmet will put you off of picking up a bike.
Newsround sent Ricky along to find out more.