You are not a brain being transported by an inconvenient body.

The tiredness you have been treating as a discipline problem may be a haemoglobin problem. The irritability may be blood sugar. The three o'clock headache may simply be water you did not drink.

Ambition without maintenance is borrowing against the one asset you cannot replace. The body rarely shouts. It whispers politely for years, and then it sends the bill in full.

A check-up is not pessimism, and it is not inviting bad news. It is the same due diligence you would run on any investment you intend to hold for another forty years.