Can someone tell me about a nice health club in london and not expensive for exemple not more than 40 pounds a?

Can someone tell me about a good health club in london and not expensive for exemple not more than 40 pounds a month,i prefer it to be along with underground central line stations
Answer
Fitness first are between £30 and £40 depending on the type of membership you select. http://www.fitnessfirst.co.uk