Meanings of much briskness in English

The talk was at first rather rambling, and was not kept up with much briskness on either side.

My General, arise; there is much briskness upon deck, and the waves are dancing beautifully in the full moon.

Sometimes he hauls up his line, with as much briskness as he can, and finds a sculpin on the hook.

Dinner over, Richard looked hurriedly at his watch, and said, with much briskness, I shall just be in time, sir, if we walk.

Although he was sixty-eight, he showed as much briskness and sprightliness as any young sawbones calling in a friendly way to perform a little operation.