Besides the limits of breath-hold, immersion in water and exposure to high ambient pressure also have physiological
effects that limit the depths and duration possible in freediving.
Examples of freediving activities are
traditional fishing techniques, competitive and non-competitive freediving,
competitive and non-competitive spearfishing and freediving photography. There are also a range of
competitive
apnea
disciplines; in which competitors attempt to attain great depths, times, or distances on a single breath.
