Self-quarantine hasn't stopped San Francisco 49ers fullback Kyle Juszczyk from preparing himself for the upcoming season. With NFL teams' offseason programs up in the air right now and no access to team facilities, players are doing whatever they can to stay in shape.

It looks like Juszczyk has taken a page out of Rocky IV. His wife, Kristin, showed off videos of his workout routine — much of it taking place in the snow — and it would make Rocky Balboa proud. The caption read, "When the gyms are closed but Kyle still needs go workout!"

You can scroll through the post below to see all of the videos.

Juszczyk, 28, is entering his fourth season with the 49ers and his eighth in the NFL. He was among the first group of free-agent signings by head coach Kyle Shanahan and general manager John Lynch in 2017.

Juszczyk went on to post the videos on his own Instagram with the comment, "Watched a lot of Rocky IV growing up."

The 2013 fourth-round draft pick out of Harvard by the Baltimore Ravens has proven to be among the league's best fullbacks and run-blockers, and has been a critical reason for the 49ers' successful rushing attack.

H/t to TMZ Sports for the find.