He remembers watching his brother doing pushups every night before he went to bed.
Now a redshirt sophomore, Derrick Jr. is a starting defensive end for the Golden Hurricane.
“My dad's a hard worker in everything he does. My brother's a hard worker in everything he does,” Dominique said. “That was able to make them successful.
“It's put me in the position I'm in right now.”
Dominique Alexander knows he will be stepping into a tough situation Saturday.
Does he feel like he's in the crosshairs?
“Not really under the gun,” he said, “but like, ‘I can't mess up. I have to be on my stuff. I have to really know my stuff.'”
That's why he didn't balk when Corey Nelson told him to meet in the film room for extra study every morning this week at 7 a.m.
Early mornings. Long hours. Extra work. None of that is new to Dominique Alexander.
“I think he can handle it,” his dad said of his son getting his first start in the Red River Rivalry. “That's something we've always instilled in both of (my sons) — When your time is called, you have to be ready — so we feel that he is ready.”
Mike Stoops said: “He's very well prepared for this. He's going to be an unbelievable player. Hopefully, it's Saturday.”
The Sooner defensive coordinator raised an eyebrow that seemed to say that you doubt this kid at your own peril.
“He'll be well prepared, and he'll hold his own, I can guarantee you that.”
Jenni Carlson: Jenni can be reached at (405) 475-4125. Like her at facebook.com/JenniCarlsonOK, follow her at twitter.com/jennicarlson_ok or view her personality page at newsok.com/jennicarlson.