That's anecdotal. And even if there is an observable correlation it doesn't mean there's a genetic component at play, which is the implication. That assertion goes back to the old "slave genes" theory which is inherently racist.
Top 20 Rushing Yards, 2009 NCAA D-IA
1 Ryan Mathews, Fresno St
2
Toby Gerhart, Stanford
3 Dion Lewis, Pittsburgh
4 Donald Buckram, UTEP
5 Ryan Williams, Virginia Tech
6 Anthony Dixon, Mississippi St
7 Curtis Steele, Memphis
8
Vai Taua, Nevada
9 LaMichael James, Oregon
10 Joe Webb, UAB
11 Mark Ingram, Alabama
12 John Clay, Wisconsin
13 Alfred Morris, Fla. Atlantic
14 Lance Dunbar, North Texas
15 Bernard Pierce, Temple
16 Darius Marshall, Marshall
17 Noel Devine, West Virginia
18 Montel Harris, Boston College
19 Jacquizz Rodgers, Oregon St
20 Robert Turbin, Utah St
Top 20 Receiving Yards, 2009 NCAA D-IA
1 Danario Alexander, Missouri
2 Freddie Barnes, Bowling Green
3
Greg Salas, Hawaii
4 Golden Tate, Notre Dame
5
Jordan Shipley, Texas
6 Emmanuel Sanders, SMU
7 Dezmon Briscoe, Kansas
8 James Cleveland, Houston
9 Antonio Brown, Central Mich.
10 Mardy Gilyard, Cincinnati
11 David Reed, Utah
12 Eric Page, Toledo
13 Demaryius Thomas, Georgia Tech
14 Tim Brown, Rutgers
15 Shay Hodge, Mississippi
16 Damaris Johnson, Tulsa
17 Ryan Broyles, Oklahoma
18 Jeremy Williams, Tulane
19 Jonathan Baldwin, Pittsburgh
20 Jerrel Jernigan, Troy
Men's 100 Meter Dash Final, 2009 NCAA Outdoor Track & Field National Championships
1 Trindon Holliday LSU 10.00
2 Ahmad Rashad USC 10.10
3 Gerald Phiri Texas A&M 10.18
4 Terrell Wilks Florida 10.19
5 Rondel Sorrillo Kentucky 10.22
6 D'Angelo Cherry Miss State 10.22
7 Adam Harris Michigan 10.29
8 Reggie Dixon Hampton 10.38
9 Jacoby Ford Clemson 14.34
I mentioned 49 athletes above. Four of them are not black. Two of them are Caucasians.
Is that statistical enough for you, professor? Anecdotal my foot.
I don't know why, in general, blacks are faster than the rest of us. I don't know why the sky is blue. I don't know why water quenches my thirst. I'm not a scientist. It's not my job to know these things.
What I do know, however, is that they are all incontrovertible truths. I don't pretend to know why, but I just accept the fact that they are.