This doesn't look like climbing high, but it is about 2 m up and underneath is hard rock. We agreed that holding on with two hands is a good strategy. Bare feet help as well. I share the view of Roald Dahl that allowing "risk-taking" helps children learn to make their own judgements, which is most useful during the times when you are not right beside them.
The weather was sunny and hot. #ManyMonths Woollies and Hempies are naturally UV-protective and comfortable for all kinds of play. Choose loose clothing and broad-brimmed hats for summer. He was playing with water just before and thus the sleeveless top.