Heck's personal best discus throw was 161' 9.73 and occurred less than a month earlier.
Despite his track-and-field schedule, Heck has been following the workout routine that UNC sends its signees.
"I've been following it every day," Heck said. "And also, I've been trying to add in some extra stuff, just so I'm as prepared as I can be when I check in.
"All of my lifts have shot up – I've probably put on at least 30 pounds on each of my lifts. I've definitely added some muscle weight, cut down some fat, and I've definitely noticed I've gotten faster. And also, my conditioning has been great."
Heck has added 15 pounds since the end of his senior football season. He hopes to eclipse the 300-pound mark before he arrives at UNC permanently on June 18 for the second summer semester.
"Most importantly, I want to be able to move at my best," Heck said. "If I could weigh 300 pounds and still be moving as best as I could, that would be ideal."
When he arrives on campus, Heck will be sharing a suite with friend and fellow Jacksonville prep standout Shakeel Rashad, as well as fellow incoming linemen John Ferranto and Caleb Peterson.
"I think it's definitely big to have the freshman linemen rooming together so that we could build that camaraderie," Heck said. "We're going to be playing together the next four years, so it's good to build a bond between us. I think that will help us down the road when we get on the field."
Since Signing Day, Heck and Chris Kapilovic, UNC's offensive line coach, have maintained a steady line of communication. Heck also spent a great deal of time with the entire staff when he visited UNC for the Spring Game almost a month ago.
"Since I'm signed, these are my teammates," Heck said. "So I wanted to get down there to see my teammates play. Until the Spring Game, I hadn't gotten a chance to see the new offense. So I got to see the new offense, and spend time with the coaches and my new teammates.
"I thought [the offense] looked great. I can't wait to be a part of it. I was really impressed."
Heck is arriving at UNC as an offensive tackle. How the offensive line's depth chart shakes out will determine at what side of the line he'll play.
"Coach Kap' said if you're really to play, he'll play you," Heck said. "He said if you're going to help him win, he'll play you. He hasn't really told me if I'll red-shirt or not. We're going to figure that out once we show him what we can do."
Heck hasn't discussed jersey numbers with anyone at UNC. His high school number, No. 72, is currently worn by red-shirt freshman Kiaro Holts.
"I was kind of looking around at the numbers the guys were wearing at the Spring Game," Heck said. "… I'd want to get a number in the 70s."