Agility and skill are in your favor when young.

As we age we still think we are the same but lets face it we are not. Just because you have done something a thousand times before and not had an issue does not guarantee you won't get bit sometime later.

Not being harsh here just speaking from my experience. Instill in your son the need for safety now then he will always think about safety especially as he gets older.

Scrambling up bins with no regards to falling could set him up for trouble later. Agility may save him when young but may fail him later in life leading to serious injury.

Keep him safe.