Casting my play can be physically demanding (9)

I believe the answer is:

gymnastic

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'be physically demanding' is the definition.
I can't tell whether this definition defines the answer.

'casting my play' is the wordplay.
'play' indicates anagramming the letters.
'casting'+'my'='castingmy'
'castingmy' with letters rearranged gives 'GYMNASTIC'.

'can' is the link.

Can you help me to learn more?

(Other definitions for gymnastic that I've seen before include "Involving exercises" , "Very agile" .)

I've seen this clue in The Daily Express.

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