LA Fitness, which has 67 clubs, joined the stock market in 1999. Shares closed on Friday at 214 1/2p, valuing the business at £87.7m. But analysts said that any buyer would pay a significant premium and the company could be worth up to £160m. Turok, a 49-year-old South African who owns 16% of the business, is a gym enthusiast who tries to exercise every day.