What is the main reason riders must keep their arms and legs inside the slide?

Keeping arms and legs inside the slide is primarily aimed at preventing injuries. This safety measure is crucial because extending limbs outside the confines of the slide can lead to collisions with the slide structure, other riders, or obstacles in the environment, which increases the risk of serious injuries. By ensuring that all body parts are contained within the slide's boundaries, riders enhance their own safety and contribute to a smoother, safer riding experience for everyone.

While avoiding touching other riders and improving ride speed might seem valid, they are not the main reasons for this guideline. Assisting lifeguards is also not relevant in the context of rider safety on slides.