For many cycling is just a form of transport, allbeit a very healthy alternative to driving or sitting on a bus. However there are also many recreational activities using the bicycle from touring and sightseeing to BMX racing on purpose built tracks. There is also mountain biking which basically involves riding specially designed bikes almost anywhere!
From the late 1970's people have been looking for affordable ways to fly. This has resulted in the building of a whole variety of different lightweight slow flying aeroplanes. They are known under a variety of names - Microlights, Ultralights, ULMs and Light-Sport Aircraft. The names along with the regulations vary from country to country which is a major barrier to international trade and overland flight.
Gliders have been around a lot longer and the first competition was actually in 1920.While competition does test a pilots ability to understand local weather conditions and flying ability, many people do it simple for the enjoyment and sense of achievement.