Refining will occur, and if others want to come forward to help make this a more comprehensive exercise, they're entirely welcome.

BBC: Rio: Rating the environmental stars

Not only are you healthier as a result, your comprehensive exercise program, which includes cardiovascular and weight-bearing exercise, is preventing further weight gain and allowing you to maintain muscle mass so your metabolism does not drop significantly as you get older.

CNN: I'm exercising; why can't I lose weight?

Dr Gerry McCann, a lecturer in sports medicine at the Centre for Exercise Science and Medicine at Glasgow University, said the list of banned substances was so comprehensive that it was highly unlikely that an athlete could take a legal substance, but register a positive result in a doping test.

BBC: Doping: Banned substances