Doug Fister. (Photo by John McDonnell/The Washington Post) Doug Fister. (Photo by John McDonnell/The Washington Post)

Injured starter Doug Fister did exercises to test out his strained right lat muscle on Friday and “feels good about it,” Nationals General Manager Mike Rizzo said. As a result, Fister should start his throwing program “any day now,” Rizzo said.

Fister felt discomfort in his side while pitching in a minor league spring training game on Marh 27. He was prescribed a five-day rest period from throwing and placed on the 15-day disabled list, backdated to March 23. Because the starter, acquired in the offseason from Detroit, was already behind schedule thanks to his elbow issue earlier in spring, his return could be anywhere from three weeks to a month away.

Although he built up some arm strength prior to the rest, Fister will have to start essentially from scratch with his throwing program because the Nationals want to be cautious. When he first plays catch, he will throw from a distance of 60 feet before progressing to 90 and 120 feet before he throw from a mound again.