For us, it's joint costs.
So we get paid into out personal accounts then transfer a fixed amount into the joint account. I have a spreadsheet 😂.
It includes the usual gas, electric, Internet, TV costs, mortgage, house insurance etc but also both our mobiles (as we get cashback via the account for this), car tax, car payments (only one car here though - I paid for my old company car myself), car insurance, car maintenance / servicing and so on. We also overpay a fixed amount to build up household savings (repainting the house, a new boiler, repairs, replacements etc).
Personal costs are absolutely not from the joint account - petrol is whoever uses it, he pays for his motorbike costs himself, I pay for my contact lenses and so on. We do dip into the joint account to pay for petrol for long distance trips together.
Food we actually don't have thrashed out, it's on the to do list.
Gym membership - unless a joint / family membership - is a personal cost. As are his petrol costs and his personal car costs including the finance, servicing, tax, insurance, repairs etc. However the flip side would be you paying for all costs for your car separately from him. Perhaps you share the insurance costs for both cars?