But as Wednesday's ESPN Under Armour all-America game approaches, the 6-foot-5, 250-pound Clark is getting more out of the practice sessions than he thought, even if the immediate results aren't exactly what he wants.
"I can see what I'm doing in practice," the Rockdale (Texas) High product said. "I'm not doing very well. I‘m getting beat. I have to work on coming out of my stance more, and things like that."
Clark, who is committed to Texas Tech, has played tackle and guard during the first few days of practice.
He has gotten to block the likes of 6-6, 240-pound defensive end Jadeveon Clowney of South Pointe High (Rock Hill, S.C.), Scout.com's No.1 rated player in the 2011 class and 6-3, 240-pound Miami soft commit Anthony Chickillo.
"It's great," Clark said.. "You get to see what it's going to be like when you get to college. This is very intense. I learned a lot, to pick up the tempo. They're all pretty good. Nobody really stands out. They're all the same, all really good."
Clark has shown good footwork and athleticism, but his need to build upper body strength is apparent as he has had trouble staying on blocks.
And Clark quickly learned he needs to work on plenty of things, but two things stand out. "I need to get in the weight room and practice (technique)," he said. "It's a little of both. I just want to get better and learn."