strenuous effort

[Ashiuhto]

Please check out the following sentences.

(1) Performing a good drama required strenuous effort, so we kept training and practicing.
(2) It took strenuous effort to perform a good drama, so we kept training and practicing.

[bhaisahab]

Please check out the following sentences.

(1) Performing a good drama required strenuous effort, so we kept training and practising.
(2) It took strenuous effort to perform a good drama, so we kept training and practising.

They are both OK.