Yoon S. Byun/Globe Staff

Reebok employee Peggy Baker, right, has lost 67 pounds since joining the company's CrossFit program.

The Boston Globe

Baker was one of about 425 employees at Reebok who are taking part in the new fitness program.

The Boston Globe

Participants lost more than 4,000 pounds collectively during 2011 — roughly the weight of a small SUV.

The Boston Globe

Chris Marshall participated in the 6:30 a.m. CrossFit workout at Reebok.

The Boston Globe

The program has made waves at Reebok. Baker, right, joined after company president Uli Becker talked her into it.