Coming out of Montrose Christian School, Armwood was the 41st ranked recruit according to ESPN.[1] Armwood began his collegiate career at Villanova, where he averaged 2.3 points and 2.1 rebounds per game as a freshman. He improved those numbers to 2.5 points and 3.6 rebounds per game as a sophomore.[2] Due to not receiving much playing time, he decided to transfer to George Washington University and had to sit out the 2011–12 season as a redshirt. George Washington coach Mike Lonergan called Armwood "the first impact recruit we really had."[3] Armwood chose George Washington after mulling his options at Maryland, Iowa, and Texas Tech.[4]
"It was harder than I expected," Armwood said of his redshirt year. "I thought it was going to be kind of easy – just work out every day on my game, but it was a lot harder. I wasn't used to sitting out."[1] In his junior season, Armwood led the Colonials in scoring (11.9 points per game), rebounding (8.8 per game) and blocked shots (2.3 per game).[2] He nearly posted a triple double with 12 points, 10 rebounds and seven blocks in a game against Kansas State.[5] As a senior, Armwood teamed with fellow transfer Maurice Creek in leading George Washington to a 24–9 record and NCAA Tournament berth. In the Round of 64 against Memphis, Armwood tallied 21 points and 5 rebounds in a 71–66 loss to the Tigers.[3] He averaged 12.7 points, 8.4 rebounds, and 1.5 blocks per game and was named Second Team All-Atlantic 10.[2]
On January 7, 2020, Armwood was acquired by the Lakeland Magic in the NBA G League after being acquired from the Go-Go in late December.[9] On January 16, he had 14 points, eight rebounds, three steals and two assists off the bench in a win over the Windy City Bulls.[10] Armwood averaged 6.4 points, 6.2 rebounds, 2.0 assists, 1.2 blocks and 1.1 steals per game. He signed with CS Dinamo București of the Liga Națională on November 18.[11] Armwood averaged 14.6 points and 7.2 rebounds per game. On July 31, 2021, he signed with BC Šiauliai of the Lithuanian Basketball League.[12]
The Basketball Tournament (TBT)
In the summer of 2017, Armwood competed in The Basketball Tournament on ESPN for Supernova; a team composed of Villanova University basketball alum. In two games, he averaged 4.5 points and 6.0 rebounds per game to help number two seeded Supernova advance to the second-round where they were defeated 82–74 by Team Fancy.[13]