Peyton Manning's adorable son joins Broncos' pregame stretch routine

See Adorable Pictures of Peyton Manning's 4-Year-Old Son

The Denver Broncos had a pretty adorable guest during their pregame stretches on Thursday. Quarterback Peyton Manning's 4-year-old son Marshall joined the routine at Mile High Stadium, sticking pretty close to his Pro Bowl dad and mimicking his every move.

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The Broncos faced off against the Arizona Cardinals later that night, falling 22-20. Marshall took exactly the same number of snaps as his dad — zero — in the team's' final preseason warmup game. Their regular season kicks off next Sunday against the Baltimore Ravens.

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