WATCH: Isaiah Simmons runs blazing fast 40-yard dash at NFL Combine

Tony Crumpton · Assoc. Editor · Saturday, February 29 2020

Clemson linebacker Isaiah Simmons has track speed with his 238-pound frame.

Simmons proved his elite athleticism once again by showing off during Saturday's NFL Combine by running a blazing fast 4.39 forty-yard dash. He declined to run a second time as the run was already the second-fastest unofficial time in history for a linebacker behind Shaquem Griffin (4.38) in 2018.

His other results from the combine included an explosive 39-inch vertical jump and an 11-foot broad jump. These freakish measurables should keep Simmons in talks as a top-five type prospect.

Check out video of him running his 40-yard dash below:

#Clemson LB Isaiah Simmons

6-4 (93rd percentile)
39” vert (92nd percentile)
11’0” broad (98th percentile)
4.39 40-yard (99th percentile)

This is Earth’s greatest defender pic.twitter.com/uXboqqGT0Z
— Trevor Sikkema (@TampaBayTre) March 1, 2020

Isaiah Simmons
2020 #NFLCombine

• Taller than DK Metcalf

• Heavier than Roquan Smith

• Faster than Devin Hester

• Jumps higher than Julio Jones

• More explosive than Alvin Kamara@ClemsonFB @isaiahsimmons25 pic.twitter.com/NeotE79Ivg
— NFL Research (@NFLResearch) March 1, 2020

Clemson LB Isaiah Simmons’ Combine results so far:
??6-4, 238 pounds
??9 5/8th inch hands, 33 3/8th inch arms
??39” vertical jump
??11-foot broad jump
??4.39 40

This man was built in a lab.
— Field Yates (@FieldYates) March 1, 2020

Mayock with that look when you see a Clemson Tiger worth taking at 4 but it’s a year too late pic.twitter.com/xKuf5YeCBL
— George Chahrouri (@PFF_George) March 1, 2020

Some of those #Clemson highlights from Isaiah Simmons after he clocked that wicked 4.39 40-yard dash. Needless to say, you can see the sick closing speed for a 6-3 238 pound linebacker/safety. Gotta believe the #Lions will give him a look at #3 overall. pic.twitter.com/VvnG3YJcx4
— Charles Robinson (@CharlesRobinson) March 1, 2020