Mark Tewksbury talks about the ins and outs of the Olympic experience
Tewksbury calls the problem ‘doping purgatory’.
Former 100-metre backstroke gold medalist Mark Tewksbury talks about the mindset of Canadian athletes just days before heading to Rio.
He delves into the doping controversy, and why it's important for athletes to focus solely on competition.
Watch him win the gold at the Barcelona Olympics here: