noun
BAD : I hope this letter finds you in a good health.
GOOD : I hope this letter finds you in good health.
◆◆◆
Health is an uncountable noun: 'Worry can affect your health.' 'Nothing in life is more important than good health.'
noun
BAD : I hope this letter finds you in a good health.
GOOD : I hope this letter finds you in good health.
◆◆◆
Health is an uncountable noun: 'Worry can affect your health.' 'Nothing in life is more important than good health.'
Longman Common Errors English vocabulary. Английский словарь распространенных ошибок Longman. 2012