For younger children "enjoying your body" covers things like looking at how our bodies are put together such as joints, muscles, nerves, etc. and appreciating it as a well-engineered machine (for want of a better word). It also covers looking at what we're good at, for example football, climbing, running. It covers how to keep our bodies healthy so we can carry on enjoying those things.
"Physical enjoyment and excitement" would be focused on emotional literacy - e.g., how do we know when someone is happy or excited? They might smile, they might look relaxed, they could be laughing, they could be jumping up and down, etc.
"Physical closeness to others" would look at positive contact with others such as sitting together and sharing a space or activity and sharing physical affection such as holding hands or hugging. Alongside that it would also look at respecting personal space and boundaries, who it is appropriate to be physically affectionate with and when, where it's okay to touch, respecting when people don't want to be touched, PANTS rules, and so on.
Five year olds absolutely do need to know it and not all parents teach it which is part of the reason it is covered in schools.
A winner of my voice of reason for today.
Funny how some skip straight to s.e.x. (the fucking kind).