What does Jaunty strains mean

A noun with an adjective

Explanation:

Strains is the noun, plural, and the singular form means:

A force tending to pull or stretch something to an extreme or damaging degree.

Jaunty is the adjective which means:

Full of confidence and energy.

So, when put together we are talking about:

Forces pulling or stretching something noun part

in a confident and energetic way adjective part

I could think of a physical exercise that can produce Jaunty strains

Mark Twain from his childhood was a tireless adventurer, the inspiration for his literary works found in his own life. He grew up in Hannibal, a small riverside town on the Mississippi. I never forget her childhood and that is why I write her autobiography in her books, as she did in her book The Adventures of Tom Sawyer, based on her childhood on the banks of the Mississippi and later in her book The Adventures of Huckleberry Finn, a play also set on the banks of the Mississippi.

With a popular style, full of humor, Mark Twain opposes in these works the idealized world of childhood, innocent and at the same time rogue, with a disenchanted conception of the adult man, the man of the industrial age, of the "golden age" that followed the civil war, deceived by morality and civilization. In his later works, however, the sense of humor and the freshness of the infantile world evoked give way to a pessimism and a bitterness that is increasingly evident, although expressed with irony and sarcasm. Definitely Twin manages to express his childhood, taking it to the adultes, making a mixture of his beautiful childhood but without forgetting sad events that he lived in his adulthood as the death of his wife and daughters.