Pete Abraham of the Boston Globe provided video:
Price, 31, threw 25 pitches in the session. He's currently on the disabled list with an undisclosed elbow injury.
The Red Sox had Price throwing out to 120 feet in a Saturday workout. Manager John Farrell told reporters it was "another consistent work day" for the left-hander, who is slated to return later this month or in early May.
"We'll take a progression similar to spring training getting in front of some hitters in a simulated session that would be with us before he'd go out anywhere," Farrell told reporters after Monday's bullpen session. "While we have some tentative plans for that progression, we're probably responding or addressing this as David responds to the work sessions. Thus far, it's been good."
Price went 17-9 with a 3.99 ERA and 1.20 WHIP during his first season in Boston after signing a seven-year, $217 million contract in December 2015. It was the second-worst full-season ERA of his career—the worst since his rookie campaign.
Price has never had any major elbow or shoulder problems during his career, so the lingering injury is a little bit of a concern.