• In this Wednesday edition of Niners Daily, we catch up with the San Francisco 49ers top pick from the 2015 NFL Draft.*

For the first time this offseason, the entire 49ers roster is together this week for the team's three-day minicamp. The entire roster, that is, with one noteworthy exception.

Arik Armstead, the 15th overall pick in April's draft, is still at home in Sacramento.

Why?

NFL rules dictate that incoming rookies can't participate in their new team's offseason program until after their school's final exams. At most universities, the spring semester ends in early May. That's how the 49ers other 18 rookies are training at the team's facility in Santa Clara.

But at Oregon, where Armstead played defensive end, finals are taking place this week – so Armstead has had to watch from afar as his teammates got to work on the practice field.

Matt Barrows of The Sacramento Bee recently spoke with Armstead to find out what the pass-rusher and Northern California native has been up to while he waits to begin his NFL career.

"I like to keep myself busy," Armstead said. "This rule has it that I can't participate, so I try to stay busy as best I can."

Armstead's daily routine is as follows: "Wake up, work out, relax, study my playbook and work out again. That's all I've been pretty much doing."

Armstead's father, Gus, has helped train the rookie by pushing him to keep pace with the 155-pound high school basketball players he trains at a Sacramento fitness center. Armstead weighs 292 pounds.

Even though he is not at practice, Armstead downloads film from the 49ers workouts to his iPad every day. He said that the defensive concepts the 49ers use are similar to what he did in college – albeit with more complex terminology.

Armstead is able to join the 49ers on Friday, just one day after the team wraps up its minicamp. The veterans will then break for a month until the start of training camp while the rookies stick around for another week of workouts.

Armstead signed a four-year deal with the 49ers on May 15.