Sao Paolo, Brazil — of all places — is where the Chiefs and Chargers will open their NFL season Friday.

St. Joseph, Missouri, the Chiefs say, has them ready for the tropical heat.

Chiefs players spent training camp laboring at hot, humid Missouri Western State University. Coach Andy Reid ran a tougher camp than most NFL coaches do, as he always does.

So by today’s far more humane standards of NFL training camps, the Chiefs are a throwback. Their summer recalls Hall of Fame coach Sid Gillman’s 1963 San Diego Chargers, who toiled in triple-digit heat at Rough Acres Ranch, an hour-plus east of San Diego.

Current Chargers coach Jim Harbaugh excels at preparation, too.

He called Chargers director of player performance Ben Herbert “the best I’ve ever seen,” saying he makes players “hard to

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