A challenge is something that is not always easy to do at first but if you try hard enough like me you can achieve it.
My challenge is running cross country. It is a long way and so hard to keep running. I want to walk but I challenge myself. Another challenge I have is spelling. It is very hard. My biggest challenge is learning to do a wheelie. It is easy to do on a scooter but hard on a motorbike. I have a lot of challenges but I think the biggest one is spelling.