Air racing

Air racing is a sport that involves small airplanes and is practiced around the world. It is somewhat similar to auto racing; however, corporate sponsorship and broadcast media coverage occur at a much lower level than in auto racing.

Road running

Road running is the sport of running on a measured course over an established road. These events normally range from 5 km to long distance, such as half marathons and marathons, and may involve large numbers of runners or wheelchair entrants. Road running is part of group of road events known as "road races".

Road running may offer those involved a range of challenges and interests such as dealing with hills, sharp bends, varied surfaces, inclement weather, and involvement in a large group. Aerobic fitness, or the ability of the body to use oxygen, is important to help complete the long distance. Anaerobic fitness, the body's ability to respond when there isn't enough oxygen for the muscle, is helpful when encountering hills and providing energy for a sprint at the finish.
Running on roads, rather than dirt or grass, puts some stress on the knees and lower back, though it can provide an easy, even and fast surface, and puts less strain on the Achilles tendon.

Mountain biking

Mountain biking usually refers to the sport of riding bicycles possessing particular design characteristics, mountain bikes, off-road, although sometimes the term simply refers to riding a mountain bike, which can be done almost anywhere - bike trails and street riding are examples of mountain biking typically based in more urban locations. The sport requires endurance, bike handling skills and self-reliance.

It is an individual sport which can be performed almost anywhere. There are aspects of mountain biking that are more similar to trail running than regular bicycling. Because riders are often far from civilization, there is a strong ethic of self-reliance in the sport. Riders must learn to repair their broken bikes or flat tires to avoid being stranded miles from help. This reliance on survival skills accounts for the group dynamics of the sport. Club rides and other forms of group rides are common, especially on longer treks.

Mountain biking is roughly broken down into five categories: cross country, downhill, Freeride, Dirt Jump and trials/street riding. However, most mountain bikes have a similar look: knobby tires, large round frame tubing, and some sort of suspension or shock absorbers. Mountain biking can be done anywhere from a back yard to a gravel road, but the majority of mountain bikers prefer to ride trails they call singletrack. These are narrow trails that wind through forests or fields. Mountain bikers describe a sense of euphoria that results from singletrack or downhill riding.