Как по Английски будет в хорошей форме

adjective

Of a suitable quality, standard, or type to meet the required purpose.

Примеры использования:

The house was not fit for human habitation

verb

Be of the right shape and size for.

Примеры использования:

Those jeans still fit me

noun

The particular way in which something, especially a garment or component, fits.

Примеры использования:

The dress was a perfect fit

To be prepared and ready to do something

Примеры использования:

All our bags are packed, and we don't have to leave for another hour, so we're in good shape.