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You can only claim allowable expenses for the business costs. Your physical well being costs: gym membership and mental well being: buddhist festival fees are not costs that would be allowed.
Learning a new skill or qualification before you start up in business would be considered capital expenditure and not allowed.
If you are in a position to earn income before incurring any course costs it may be possible to argue that you are maintaining work-related training or continuing with professional development.
Other allowable business expenses on line 19
Everyone needs to be physically and mentally fit. Your need based on profession is not something I would argue with HMRC.
I am telling you not to do that.
That is not something that is specifically required for your profession only and is really personal in nature.
You are most welcome