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The routine is playful, upbeat and inventive — a springy thrill.

After stepping through a river, Robbie crouches down, and peels away springy grass and soil.

Nascimento no longer has the pure, otherworldly vocal tone of his youth, but Spalding bolsters him, singing in Portuguese alongside him and probing the harmonies with springy bass lines.

Advocates suggest subsequent millennia spent chasing down prey shaped many unique human features, including our springy arched feet, slow-twitch muscle fibers optimized for efficiency, heat-shedding bare skin, and prodigious ability to sweat.

It’s been open more than nine years, but the brightly painted red and yellow slides and monkey bars are still sleek and shiny, and the padded rubber tiles feel springy underfoot.