Kerrigan also skated in public for the first time, in Stoneham, Mass., since the incident.
Mr. Safir has been skating since 1992, when his wife gave him a pair of skates for his 50th birthday.
The 50 kilometre has been skated as a mass start event at the World Championships since 2005 and since the 2006 Winter Olympics.
Duffel has been skating since age ten, and turned pro at age eighteen.
Lindros skated with pads for the first time since the concussion and he used an exercise bike.
Jorrit Bergsma is skating for the BAM team since the season 2010-2011.
Virtue and Moir have been skating together since 1997.
She is an especially noted skateboarder, who has been skating since 1998, first with a boyfriend, then by herself.
Trankov later said that he had wanted to skate with Volosozhar since 2006.
Lindros has been skating since October at York University in Toronto.