4. Soon they were skateboarding skillfully up ramps and doing tricks in the air .
5. This is called " ramps " skateboarding .Then they started skateboarding and doing tricks on the streets .
6. This was “ street-style ” skateboarding - a combination of freestyle and ramp .
7. For this,the skateboarders needed protective clothing such as knee and elbow pads and helmets . This allowed them to skateboard safely.
8. Today skateboarding is still a very popular sport, and there are lots of competitions .