(HealthDay News) -- Inline skating offers a fun, low-impact workout that can burn as many calories as cycling or running.

About 20 million people in the United States use inline skates each year, but as many as two-thirds don't wear safety gear, says the U.S. Consumer Product Safety Commission. About 11,000 inline skaters in the United States suffer head or face injuries each year, the agency estimates.

The National Safety Council says inline skaters should always wear elbow and knee pads, a helmet, light gloves, and wrist guards.

If you're new to inline skating, you should take a course to learn the basics. Stick to level ground, and be alert for other people on bike paths, trails and sidewalks. Don't skate on roads, and be especially careful when crossing streets.

Look for potential hazards such as potholes, water or debris, and don't skate on wet or oily surfaces.