Alvarez (knees) posted a video of himself running the bases on his personal Instagram account Tuesday, Chandler Rome of the Houston Chronicle reports.
The 23-year-old was running on an anti-gravity treadmill in mid-October, and he's continued to progress his running program over the past couple months. Alvarez underwent arthroscopic surgery on both knees in late August, and it's a good sign to see him on the basepaths with no obvious limitations. There's still a couple months before the start of spring training, and Alvarez is expected to be ready by that point.