"Francisco Liriano's shoulder problems stem from him not keeping up with strengthening exercises during the offseason.

Liriano threw several bullpen sessions in the weeks leading to the start of camp but came down with tendinitis just before he left his native Dominican Republic for Fort Myers. An MRI done in Miami showed no structural damage.

Twins pitching coach Rick Anderson said he asked Liriano whether he did all of his shoulder exercises during the offseason, and Liriano said no.

"He's been doing them here, and now his shoulder is strong,'' Anderson said.

Liriano played catch from 120 feet on Sunday and will resume bullpen sessions on Tuesday."