Take a look at these two mice.
The one on the right has four times the muscle mass as the "normal" mouse on the left.
This is just one of the laboratory benefits that can be had using the new gene transfer technology or as some have called it DNA doping.
The potential of these sort of dramatic results has not been lost on the sports world.
According to the UK's Telegraph newspaper:
"Lee Sweeney, professor of physiology at the University of Pennsylvania, is a popular man in the world of sport.
He gets between five and 10 emails a week from athletes, some from Britain, and so many phone calls that his secretary has stopped putting them through. And that is in a quiet week.
If he publishes an academic paper or does a media interview, a flurry of 50 or more calls and emails usually follows, as it did 10 years ago when he first revealed his 'mighty mice' to the world at a meeting of the American Society for Cell Biology – laboratory mice with enormous muscles that retained their strength and regenerative ability even when the animals reached old age.
Sweeney's super-strong rodents were the product of his pioneering research into gene transfer technology and the implications were clearly not lost on the athletes and coaches who got in touch, one of whom offered $100,000 for what the mice were getting.
Shockingly, Sweeney also received a request from a high school American football coach for his entire team to be genetically modified.
Sweeney told him what he is still telling everyone a decade later, that bulking up on gene therapy is not yet safe enough for humans and would require heavy-duty immune suppression. He always gets the same response.
"Even if I explain to them that to make it work might require all sorts of heroic measures, they basically say, 'Fine. I'll do it'. And if it's a matter of money, they'll get the money."