Source: Mike Wilkening, NBC Sports Pro Football Talk 
According to Kevin Bowen of Colts.com, Richardson was stretching with teammates before Friday’s practice. Also, Mike Chappell of the Indianapolis Star reported that Richardson was indeed practicing.
Friday practice underway and Trent Richardson taking part in pre practice stretching with the rest of the team. Looks ready to go today
— Kevin Bowen (@KBowenColts) November 8, 2013 
#colts  Trent Richardson, Hugh Thornton practicing.
— Mike Chappell (@mchappell51) November 8, 2013