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.
The Sport pilot airplane license is about half the cost of the private pilot airplane license. Using airplane as an example, some schools offer the minimum hours and $2500 to get your sport pilot license. However, this is only the minimum flight hours and it typically takes more time/hours than this minimum. For this low rate there is typically no ground school included.