Students of the roller skating team are trained by their coach on the playground of No.6 Experimental Primary School in Zunhua City, north China's Hebei Province, June 11, 2019. The No.6 Experimental Primary School in Zunhua introduced roller skating into school as a community activity for students. (Photo: Xinhua)

The coach interacts with students of the roller skating team on the playground of No.6 Experimental Primary School in Zunhua City, north China's Hebei Province, June 11, 2019. The No.6 Experimental Primary School in Zunhua introduced roller skating into school as a community activity for students. (Photo: Xinhua)

The coach interacts with students of the roller skating team on the playground of No.6 Experimental Primary School in Zunhua City, north China's Hebei Province, June 11, 2019. The No.6 Experimental Primary School in Zunhua introduced roller skating into school as a community activity for students. (Photo: Xinhua)

Students of the roller skating team practise on the playground of No.6 Experimental Primary School in Zunhua City, north China's Hebei Province, June 11, 2019. The No.6 Experimental Primary School in Zunhua introduced roller skating into school as a community activity for students. (Photo: Xinhua)