Which convenience reduces physical activity?
car
bicycle
in-line roller skates
ice skates

The car is a convenience that reduces physical activity. All the others, bicycle, in-line roller skates, and ice skates are very good physical activities that are aerobic exercises and contribute to enhance physical conditions. On the contrary the use of car does not involve physical activity, becasue the driver and passengers are sitted and do not perform movements that increase heart rate of demand the muscles.