What are the Enhanced Games - or the 'Olympics on steroids'?

The inaugural Enhanced Games will feature dozens of elite athletes using performance-enhancing drugs to try and break world records in track, weightlifting and swimming.

Some $25m (£18.6m) in prize money is up for grabs - with world records in certain events paying a $1m (£740,000) bonus.

The drugs they use must be legal, and approved by the Federal Drug Administration.

But substances like testosterone and human growth hormone - banned by the World Anti Doping Agency - are not only celebrated here, they're encouraged and for sale.

Shaimaa Khalil reports from Las Vegas.