I believe that swinging is a fun and beautiful memory of most people's childhood. I remember that I was running around the swing and laughing with playmates when I was a child. Because there was only one swing, and there were many small partners, it was necessary to queue up. The first person in the line would help push the swing. Some friends occasionally played pranks and suddenly pushed the swing hard, the person sat on the swing would be startled and scream, and then the friends in the queue laughed. 

As children we didn't think about safety. For example, if you fell off the swing, you will be injured, and if the chain was worn for a long time, would it suddenly fall off and so on. 

Fortunately, engineers have considered these safety issues and conducted safety tests when developing products.

For example use the Swing Suspension Connector Durability Tester to check if the suspension connector is robust enough after many times of use.

This durability is used for the safety of children when they are playing on swings.Suspension connectors and means of suspension are cycled 180 000 times under load to simulate use.

The swing angle is ±5°~±45°(10°~90°).This meets standard ISO8124-4 6.8,EN71-8,EN1176-2.It meets multiple standards and adds multiple guarantees to the safety of children.

https://youtu.be/UKz3U5X9Dg8