NHL legend Zdeno Chára just added another accomplishment to his resume ... the former Bruins star completed the famed Boston Marathon in just over 3 1/2 hours!!
Zdeno finished the course -- 26.2 miles long -- on Monday in the 127th installment of the event, with a time of 03:38:23 ... good for an 8:20 min/mile pace.
FYI, the Boston Marathon features 30,000 athletes from more than 100 countries.
Chára -- who spent 24 years in the NHL -- got off to a good start .