Haemophilia might mean you need to be aware of the risks. It might mean you need to think twice about certain activities. It might even mean you have to keep friends, family and your school in the loop.
But it shouldn't mean you're not taking part. Here, we help you find an activity that's the right fit for you and share real stories from boys who have overcome their own challenges.
Because like anyone else, exercise and sport can kickstart a long, healthy, happy life. One full of opportunities to make new friends, learn new skills and get faster and stronger.
So you want to be active, but what are you going to do? There are some contact sports which you should avoid, but otherwise it's up to you to find something you enjoy and that suits you.*
Here are some ideas to get you started - and they are not all organised sports!
* Always speak with your haemophilia care team before taking on a new activity.
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Here, five boys living with haemophilia talk about the challenges they've overcome and how they've found activities that are right for them.see the boys' stories
Nine-year-old Henry, who has haemophilia A, loves swimming and cycling, but he's always on the lookout for new activities. Here, he talks about how he's getting faster and stronger every day.
When Paul saw his older brother practising in the nets as a child, he knew cricket was what he wanted to do. Fast-forward more than a decade, and a 17-year-old Paul is a high performing player for his county... who happens to have severe haemophilia A.
Thirteen-year-old Ishmael has severe haemophilia B. He's hugely passionate about climbing, which he first discovered at a local club. Here, he talks about why haemophilia won't hold him back.
Joshua is 12 years old, and has severe haemophilia A. Here, he talks about overcoming an illness to fulfill his ambition to master riding a bike.
Taking up a new sport or activity isn't always easy for children and young people living with haemophilia, or their parents. Here, Dr Kate Khair, consultant nurse, explains why being active is so important and five parents share what they have learnt along the way.