Apple Watch 5 in Airplane Mode

Hello guys,

I would like to buy an Apple Watch 5 and would prefer to use it in airplane mode for most of the day

Can you tell me what works and what doesn't work in airplane mode? I am particularly interested in functions related to the tracking of sports and heart activity. And related notifications (for example, notifications of any cardiac abnormalities, etc)

Other notifications (messages, calls, inutility) do not interest me