Chris Johnson surprised his 40 yard dash record stands

Arizona Cardinals running back Chris Johnson is surprised that his 40 yard dash record of 4.24 seconds remains intact after eight years.

Arizona Cardinals running back Chris Johnson is surprised that his 40 yard dash record of 4.24 seconds has stood for eight years, he told told Sirius XM NFL Radio.

"To be honest, I don't want to see the record go,” Johnson said. “But if somebody does break it ... I'll be happy for them and give them a handshake and congratulate them.”

Watch Johnson's record-setting run from 2008 below:

[youtube: https://www.youtube.com/watch?v=3NM2UhXfnhk]

Adidas is offering $1 million to any player that breaks Johnson's record if they accomplish the feat while wearing the company's shoes.

Dri Archer threatened the record when he ran 4.26 at the 2014 NFL combine.

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This year's NFL combine prospects include TCU's Kolby Listenbee who posted a 10.04-second 100-meter dash time in 2015. Notre Dame's Will Fuller will also chase the record after running away from Adoree' Jackson, a USC Olympic hopeful in track and field, in the Fighting Irish's clash with the Trojans in October. Florida State's Jalen Ramsey is another candidate to challenge Johnson's mark after winning the ACC long jump title in indoor and outdoor track.