The whole muscle of which the muscle fibres are a part can develop force in several different ways, e.g. with the muscle as a whole shortening, lengthening or maintaining the same length while the muscle fibres contract. List of types of muscle contraction. Isotonic (of which there are two types: concentric and eccentric)
While some flight schools will advertise that you can get a pilot's license for around $5,000, the reality is that the cost generally works out to be more. A commercial pilot's license -- bigger plane, more than twice the flight time -- generally costs $40,000 to $50,000.
A structured school will cost around $12,000 (all-inclusive) for just the private pilot's license from start-finish, while lesson-by-lesson training can run in the neighborhood of $4,800-$14,000, depending on your pace. Flight training is expensive without a doubt, but in the end it is quite worth the money spent.