Duncan Bannatyne was known for founding the health-club chain Bannatyne Fitness, later branded Bannatyne Health & Fitness.
The chain developed from Bannatyne's business activities in health and leisure. Its clubs offer facilities associated with fitness centres, including exercise equipment and, at many sites, additional leisure or wellness services.
Bannatyne brought this entrepreneurial background to Dragon's Den, where he became one of the programme's most recognizable investors. His public profile combined television, business writing and charitable work, but health clubs remained one of the clearest businesses associated with his name.
A possible source of confusion is that the chain has changed branding over time and is often called Bannatyne Health Club or Bannatyne Health & Fitness. Those names refer to the same wider business identity. The answer is the investor's personal name, not the later corporate brand wording.