Some competitors have also jumped at the opportunity to gain sales as women seek alternative treatments.

"As with any good idea, competitors jump into the marketplace," Mr. Dowis said.

And, he added, "in three years, when numerous competitors have jumped in and the price has collapsed, whatever is left will be very small."

A third wireless competitor, Omnipoint Communications, may soon jump into the fray with its own introductory offer of free minutes.

The competitor must then pull herself up and jump to a floating pad and then proceed to the next obstacle.

In the individual events, competitors jump twice, and the combined score determines the winner.

The opening takes place in a stadium, while competitors jump over hurdles and how the colours change from sepia to colour.

Other methods used include the "Carlene Pop," where the competitor jumps up and down while eating, to force the food down to the stomach.

The iPhone development brought the term out of obscurity and now Apple's competitors are just jumping on the name recognition bandwagon.

In addition, four competitors quickly jumped in.