Impeccable health record for Mexico City

AIR FORCE ACADEMY, Colo. — Neither practicing in a 9-degree wind chill on Thursday, nor moving upcoming workouts indoors to artificial turf, could hamper the 49ers’ bountiful health after a one-day stint. week in these cold confines.

The 49ers are as close to full strength as they’ve been all season, and that bodes well as they fly to Mexico City on Sunday for Monday night’s game against the Arizona Cardinals.

Objective of this week: acclimatization to the altitude. Did it work?

“I don’t know. That’s what the science says,” coach Kyle Shanahan replied.

Wide receiver Deebo Samuel replied, “(Friday) we felt it a lot, because we did a lot in practice. Today we felt it a little. I feel like we’ll be ready to go.

Defensive lineman Arik Armstead won’t be ready, however, and will miss his sixth straight game as he nears recovery from a stress fracture in his lower leg. Defensive end Samson Ebukam is the only other player on the 49ers’ injury report, and it’s questionable due to a quadriceps injury that limited his return to practice Friday and Saturday; it kept Ebukam out of last Sunday’s win over the Los Angeles Chargers.

Perhaps the only mystery on Saturday concerned cornerback Charvarius Ward, who joined the team and trained on Saturday after missing the previous two days for a family matter.

The 49ers will fly to Mexico City after light training on Sunday, then return to the Bay Area immediately following their first game in Mexico since 2005 and their first international game since 2013 (London).

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Defensive end Nick Bosa, who played in all but two games last game en route to a season-high 54 snap performance, perhaps best exemplifies the 49ers’ full-speed approach. “The last game I felt fresh,” Bosa said.

And what about the health of Jimmy Garoppolo, eight months after right shoulder surgery that turned his career upside down for a sixth season with the 49ers?

“Yes, I feel good,” Garoppolo said. “No different to other years. It was a good offseason; it wasn’t my typical offseason, so I had to save the body a bit. I think he’s paying dues right now.

REMARKS

* Scouting team honors this week went to tight end Ross Dwelley, linebacker Marcellino McCrary-Ball and defensive back Qwuantrezz Knight.

* Even though the snow mostly melted on the outdoor courts, the 49ers opted to practice a second straight day inside the Holaday Athletic Center. They will return on Sunday for a brief visit before flying to Mexico.

* The 49ers are seeking their 51st “Monday Night Football” victory, which would eliminate them from a tie with the Pittsburgh Steelers for most in NFL history.

* Brandon Aiyuk’s four-game streak with at least six catches and 80 yards is the 49ers’ longest since Terrell Owens in 2001. If Aiyuk extends that streak Monday night, he’ll join Owens (2001) and Jerry Rice (1994) as the only Niners since 1970 with those numbers over five straight games.

* The 49ers offense has the fifth-best conversion rate in the NFL on third-and-long, converting 45.6 percent of their third plays needed at least 10 yards for a first down.

* Kicker Robbie Gould, with 433 career field goals, is four behind Sebastian Janikowski and Jason Elam for ninth all-time in NFL history.