And why doping cheats may never be caught.
Here are some of the more popular sports supplements on the market today, separated into categories based on how effective and safe research shows they are.
Whole body vibration therapy is undertaken by standing, sitting, lying or doing exercises on specifically designed equipment that oscillates at relatively high frequencies.
Named after the Greek word "kreas" meaning flesh, creatine is an amino acid derivative found in all cells in the body, but is stored primarily in muscle.
The advice on the sides of protein tubs may have to change.
What science can tell us about ageing and strength.