WASHINGTON — Before Thursday night’s Denver Broncos vs. Arizona Cardinals game, Broncos quarterback Peyton Manning had a special workout partner.…
Peyton Manning , Marshall Manning Denver Broncos quarterback Peyton Manning stretches as his son, Marshall Manning, 4, chases behind prior to an NFL preseason football game against the the Arizona Cardinals, Thursday, Sept. 3, 2015, in Denver. (AP Photo/Matt York)
AP Photo/Matt York
Peyton Manning Denver Broncos quarterback Peyton Manning, center, leads teammates in running drills prior to an NFL preseason football game against the Arizona Cardinals, Thursday, Sept. 3, 2015, in Denver. (AP Photo/Matt York)
AP Photo/Matt York
Peyton Manning , Marshall Manning Denver Broncos quarterback Peyton Manning stretches as his son, Marshall Manning, 4, chases behind prior to an NFL preseason football game against the the Arizona Cardinals, Thursday, Sept. 3, 2015, in Denver. (AP Photo/Matt York)
AP Photo/Matt York
Peyton Manning , Marshall Manning Denver Broncos quarterback Peyton Manning, right, stretches with his son, Marshall Manning, 4, prior to an NFL preseason football game against the the Arizona Cardinals, Thursday, Sept. 3, 2015, in Denver. (AP Photo/Matt York)
AP Photo/Matt York
Peyton Manning , Marshall Manning Denver Broncos quarterback Peyton Manning walks with his son, Marshall Manning, 4, prior to an NFL preseason football game against the the Arizona Cardinals, Thursday, Sept. 3, 2015, in Denver. (AP Photo/Matt York)
AP Photo/Matt York
Peyton Manning , Marshall Manning Denver Broncos quarterback Peyton Manning stretches with his son, Marshall Manning, 4, prior to the Broncos' NFL preseason football game against the Arizona Cardinals, Thursday, Sept. 3, 2015, in Denver. (AP Photo/Matt York)
AP Photo/Matt York
Peyton Manning , Marshall Manning Denver Broncos quarterback Peyton Manning, right, stretches with his son, Marshall Manning, 4, prior to an NFL preseason football game against the the Arizona Cardinals, Thursday, Sept. 3, 2015, in Denver. (AP Photo/Matt York)
AP Photo/Matt York
Peyton Manning , Marshall Manning Denver Broncos quarterback Peyton Manning stretches with his son, Marshall Manning, 4, prior to an NFL preseason football game against the the Arizona Cardinals, Thursday, Sept. 3, 2015, in Denver. (AP Photo/Matt York)
AP Photo/Matt York
Peyton Manning , Marshall Manning Denver Broncos quarterback Peyton Manning stretches with his son, Marshall Manning, 4, prior to the Broncos' NFL preseason football game against the Arizona Cardinals, Thursday, Sept. 3, 2015, in Denver. (AP Photo/Matt York)
AP Photo/Matt York
Peyton Manning , Marshall Manning Denver Broncos quarterback Peyton Manning stretches with his son, Marshall Manning, 4, prior to an NFL preseason football game against the the Arizona Cardinals, Thursday, Sept. 3, 2015, in Denver. (AP Photo/Matt York)
AP Photo/Matt York
Peyton Manning , Marshall Manning Denver Broncos quarterback Peyton Manning warms up with his son, Marshall Manning, 4, prior to the Broncos' NFL preseason football game against the Arizona Cardinals, Thursday, Sept. 3, 2015, in Denver. (AP Photo/Matt York)
AP Photo/Matt York
Peyton Manning , Marshall Manning Denver Broncos quarterback Peyton Manning stretches with his son, Marshall Manning, 4, prior to an NFL preseason football game against the the Arizona Cardinals, Thursday, Sept. 3, 2015, in Denver. (AP Photo/Matt York)
AP Photo/Matt York
Peyton Manning , Marshall Manning Denver Broncos quarterback Peyton Manning stretches with his son, Marshall Manning, 4, prior to an NFL preseason football game against the the Arizona Cardinals, Thursday, Sept. 3, 2015, in Denver. (AP Photo/Matt York)
AP Photo/Matt York
Peyton Manning , Marshall Manning Denver Broncos quarterback Peyton Manning stretches with his son, Marshall Manning, 4, prior to an NFL preseason football game against the the Arizona Cardinals, Thursday, Sept. 3, 2015, in Denver. (AP Photo/Matt York)