Peter Attia, a doctor who wrote the longevity book Outlive, said this to readers who asked whether they had started training too late. It sounds like comfort. It is the removal of your last excuse.

"Too late" is a useful belief. It lets you skip the work and call the skipping realism.

The line takes that away.

Attia's plan starts from the final decade of your life. He asks you to list what you want to still do at ninety.

Carry the groceries up from the car park. Get up off the floor without a hand. Lift a grandchild who is running at you.

Then he asks what each of those needs from your body, and how much of it you lose every year you wait.

Go to any void deck at seven in the morning. The aunties doing slow drills in the open air are not athletes. Most started late, some after a fall that scared them. They started anyway. Their legs are the proof the line is true.

The cost of starting at fifty is real. The cost of starting at fifty-one is higher, and you never see that bill until the stairs send it.

So today: one thing from the ninety-year-old's list, done once, before lunch. Twenty slow squats to a chair. Or a walk with the heavy shopping bags held at your sides.

You are breathing. That was the only condition.