There should not be any compulsion, on which kind of exercises should be practiced.
There should not be any compulsion as to which exercises should be practiced.
--- Compulsion on OR Compulsion as to ...
"As to". I think if there is to be any compulsion "on" anything, it would be on the exercisers. What is that comma doing there?
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"As to". I think if there is to be any compulsion "on" anything, it would be on the exercisers. What is that comma doing there?
I guess you know that the sentence is rather circumlocutory.