A rope in the masjid
There is a report that is worth picturing rather than just reading.
The Prophet, peace be upon him, came into the masjid and found a rope stretched between two pillars. He asked what it was for and was told it belonged to Zaynab, who prayed at night and held onto it when she got tired.
He had it taken down, and he said to pray as long as you feel active, and when you get tired, sit down.
That is the tradition itself dismantling a devotional aid because it was being used to push past capacity. Not a permission grudgingly granted. An instruction, and the rope came down.