The squeals of delight from a backyard with a trampoline are proof that hours of jumping is lots of fun for littlies, not to mention a great energy-burner.

But there’s a flip side. The Chiropractors’ Association of Australia (CAA) says trampoline injuries have almost doubled in a decade.

The most common injuries include fractures and dislocations, especially in children aged from five to 12.

Spinal damage is a concern too, especially if more than one child jumps at a time, explains Bryce Conrad, president of the CAA’s NSW branch.

To help avoid injuries, set rules beforehand, such as one child on the trampoline at a time, and always supervise jumpers.