Think quarantine is gonna stop S.F. 49ers star Kyle Juszczyk from training to get back to the Super Bowl???
HELL NO!!! The Niners fullback is doing straight-up Rocky-style workouts while in isolation ... squatting a whole damn tree in the snow!!!
Juszczyk's smokin' hot wife posted the footage of the 28-year-old getting in lifts out in the wilderness ... and it's pretty intense.
You can see in the videos, Juszczyk sled-pulls his wife (and others) through snow AND dirt to get some leg work done.
Then, the 6-foot-1, 240-pound NFL player gets some jump squats in .