Which sentence is grammatically correct of the two below? Or are both ok?
- This one is a classic course provided by us, with Ashtanga yoga as focal exercise.
- This one is a classic course provided by us, with Ashtanga yoga as the focal exercise.
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Neither of the sentences is satisfactory.
focal means central, and we expect it to be followed by a singular noun- the one central thing. We might accept a plural at a pinch- several central things- but we cannot accept the idea of an uncountable noun after focal.
Ashtanga Yoga can indeed be exercise without a the, but in this meaning exercise is uncountable. Putting an uncountable noun after focal doesn't really work.
A particular Ashtanga Yoga asana can be an exercise, and that would be countable, but one asana as the focus probably isn't the idea that you want to convey.
It would work better if you treated Ashtanga Yoga as a type or style of excercise: both of these would be singular, so they would work with focal.
This one is a classic course provided by us, with Ashtanga yoga as the focal style of exercise.
A better way of expressing the same meaning would be:
This one is a classic course provided by us, with Ashtanga yoga as the theme.