The NFL Combine measures players using both 20-yard and 60-yard shuttle drills. The shuttles, much like the 3-cone drill, test speed and acceleration. The only difference is that players are running laterally instead of forming a right angle.
Who can improve draft stock the most: Pass rushers, wide receivers, running backs.
The Rules: The shuttle runs take place between a set of cones. For the 20-yard shuttle, the player starts in a three-point stance and then runs five yards to his right, touches the ground, reverses and runs back 10 yards, touches the ground, before heading back five yards to the finish line. The 60-yard shuttle is similar, but instead of a 5-10-5 pattern, players run in a 10-20-10 pattern to the finish. The extra distance can help test an athlete's endurance in addition to quickness and burst.
Current NFL Combine record:
Cornerback Jason Allen (2006)/ Wide receiver Brandin Cooks (2014) – 3.81 in the 20-yard shuttle
Wide receiver Shelton Gibson (2017) – 10.71 seconds in the 60-yard shuttle
Here are some current Texans who excelled in the shuttle drills during their NFL Combine performance:
20-yard shuttle times
Bradley Roby (2014) – 4.04
Lonnie Johnson (2019) – 4.10
Chad Hansen (2017) – 4.13
Justin Reid (2018) – 4.15
Gareon Conley (2017) – 4.18
J.J. Watt (2011) – 4.21
Zach Cunningham (2017) – 4.29
Deshaun Watson (2017) – 4.31
60-yard shuttle times
Johnathan Joseph (2006) – 11.23
Will Fuller (2016) – 11.44
Kahale Warring (2019) – 11.72
The 2020 NFL Scouting Combine takes place Tuesday, February 25 through Sunday, March 1. On-field drills begin on Thursday, February 27 at Lucas Oil Stadium in Indianapolis.
Check out shots of current Texans offensive players from previous NFL Combines. (Photos via AP Images)

Clemson quarterback Deshaun Watson runs a drill at the NFL football scouting combine Saturday, March 4, 2017, in Indianapolis. (AP Photo/David J. Phillip)

Clemson receiver DeAndre Hopkins runs a drill at the NFL football scouting combine in Indianapolis, Sunday, Feb. 24, 2013. (AP Photo/Michael Conroy)

Notre Dame receiver Will Fuller V runs a drill at the NFL football scouting combine on Saturday, Feb. 27, 2016, in Indianapolis. (AP Photo/Darron Cummings)

Mississippi offensive lineman Laremy Tunsil runs a drill during the 2016 NFL Scouting Combine on Friday, Feb. 26, 2016 in Indianapolis. (Perry Knotts via AP)

Clemson receiver DeAndre Hopkins runs a drill at the NFL football scouting combine in Indianapolis, Sunday, Feb. 24, 2013. (AP Photo/Michael Conroy)

Oklahoma receiver Kenny Stills runs a drill during the NFL football scouting combine in Indianapolis, Sunday, Feb. 24, 2013. (AP Photo/Dave Martin)

Miami running back Duke Johnson runs a drill at the NFL football scouting combine in Indianapolis, Saturday, Feb. 21, 2015. (AP Photo/David J. Phillip)

Alabama State offensive lineman Tytus Howard runs a drill at the NFL football scouting combine in Indianapolis, Friday, March 1, 2019. (AP Photo/Michael Conroy)

Clemson quarterback Deshaun Watson is seen in a drill at the 2017 NFL football scouting combine Saturday, March 4, 2017, in Indianapolis. (AP Photo/Gregory Payan)

Northern Illinois offensive lineman Max Scharping runs a drill at the NFL football scouting combine in Indianapolis, Friday, March 1, 2019. (AP Photo/Michael Conroy)

Mississippi State tight end Jordan Thomas runs a drill at the NFL football scouting combine in Indianapolis, Saturday, March 3, 2018. (AP Photo/Michael Conroy)

Notre Dame receiver Will Fuller runs a drill at the NFL football scouting combine, Saturday, Feb. 27, 2016, in Indianapolis. (AP Photo/L.G. Patterson)

Notre Dame offensive lineman Nick Martin runs a drill at the NFL football scouting combine in Friday, Feb. 26, 2016, in Indianapolis. (AP Photo/Darron Cummings)

Texas Tech wide receiver Keke Coutee runs the 40-yard dash during the NFL football scouting combine, Saturday, March 3, 2018, in Indianapolis. (AP Photo/Darron Cummings)

Tennessee offensive lineman Zach Fulton runs a drill at the NFL football scouting combine in Indianapolis, Saturday, Feb. 22, 2014. (AP Photo/Michael Conroy)

Oklahoma receiver Kenny Stills runs a drill during the NFL football scouting combine in Indianapolis, Sunday, Feb. 24, 2013. (AP Photo/Dave Martin)

Clemson quarterback Deshaun Watson throws a pass during the 2017 NFL Scouting Combine at Lucas Oil Stadium on Saturday, March 4, 2017 in Indianapolis. (Perry Knotts via AP)

Clemson receiver DeAndre Hopkins runs a drill during the NFL football scouting combine in Indianapolis, Sunday, Feb. 24, 2013. (AP Photo/Dave Martin)

Washington offensive lineman Senio Kelemete runs a drill at the NFL football scouting combine in Indianapolis, Saturday, Feb. 25, 2012. (AP Photo/Michael Conroy)

Clemson quarterback Deshaun Watson is seen after a drill at the 2017 NFL football scouting combine Saturday, March 4, 2017, in Indianapolis. (AP Photo/Gregory Payan)

Clemson receiver DeAndre Hopkins runs a drill at the NFL football scouting combine in Indianapolis, Sunday, Feb. 24, 2013. (AP Photo/Michael Conroy)

San Diego State tight end Kahale Warring runs a drill at the NFL football scouting combine in Indianapolis, Saturday, March 2, 2019. (AP Photo/Michael Conroy)

Clemson receiver DeAndre Hopkins runs a drill during the NFL football scouting combine in Indianapolis, Sunday, Feb. 24, 2013. (AP Photo/Dave Martin)

USC wide receiver Steven Mitchell runs a drill at the NFL football scouting combine in Indianapolis, Saturday, March 3, 2018. (AP Photo/Michael Conroy)

Mississippi offensive lineman Laremy Tunsil runs a drill at the NFL football scouting combine in Indianapolis, Friday, Feb. 26, 2016. (AP Photo/Michael Conroy)

Clemson quarterback Deshaun Watson runs the 40-yard dash at the NFL football scouting combine in Indianapolis, Saturday, March 4, 2017. (AP Photo/Michael Conroy)

Clemson receiver DeAndre Hopkins runs a drill during the NFL football scouting combine in Indianapolis, Sunday, Feb. 24, 2013. (AP Photo/Dave Martin)

Notre Dame receiver Will Fuller runs the 40-yard dash at the NFL football scouting combine on Saturday, Feb. 27, 2016, in Indianapolis. (AP Photo/Darron Cummings)

Clemson quarterback Deshaun Watson warms up during the 2017 NFL Scouting Combine at Lucas Oil Stadium on Saturday, March 4, 2017 in Indianapolis. (Perry Knotts via AP)

Notre Dame receiver Will Fuller runs a drill at the NFL football scouting combine, Saturday, Feb. 27, 2016, in Indianapolis. (AP Photo/L.G. Patterson)

Miami running back Lamar Miller runs the 40-yard dash at the NFL football scouting combine in Indianapolis, Sunday, Feb. 26, 2012. (AP Photo/Michael Conroy)

Alabama quarterback AJ McCarron throws during a drill at the NFL football scouting combine in Indianapolis, Sunday, Feb. 23, 2014. (AP Photo/Michael Conroy)