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He told BBC News the detention of his parents - who have lived in Afghanistan for 18 years and ran education projects - had been "harrowing and exhausting" for their family.

It can also result in plants being killed before they have time to mature and produce a lot of seeds, exhausting the seed bank and hindering recovery, Becker said.

On set, it was said he could be petulant and exhausting, an attitude that alienated directors and his co-stars, including Marlon Brando on the set of “The Island of Dr. Moreau.”

When Ali beat Foreman in their only meeting in Zaire, he hit Ali with everything, including the kitchen sink, for seven exhausting rounds.

She said there was support but that it did not help with the emotional toll, adding that she found the process "exhausting".