lasso posts and fence pickets

[Tweetyy]

At first the city boys and girls were much interested in watching Jim lasso posts and fence pickets, but they soon tired of it, and even Jim decided it was not the right sort of sport for cities.

I cannot understand this section of the phrase. could you explain me please?

lasso posts and fence pickets

does it mean, Jim throws a lasso and catchs fences?

[Kitosdad]

YES. "in watching Jim lasso posts and fence pickets."
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Keep it simple ... Keep it interesting.

[Tweetyy]

thank you Kitosdad