"A lifeguard parent sits on the sidelines of a child’s playtime, their conversations with friends, their homework, household chores, and other interactions with the world. A lifeguard parent keeps an eye on what’s going on, ready to dive in if needed, but otherwise stays out of the way. They know what a healthy baseline looks like and recognize immediately when things start to go off the rails. Most of the time nothing serious happens, so the parent does not insert themselves needlessly in their kid’s activities."
...as opposed to a helicopter parent.
"For example, instead of hollering, 'Stay off that branch!' the parent might say, 'Do you think that branch can support you?'"
Must admit a 3 or 4 year old probably won't be able to use reason and logic to figure that out.