500
Swimming is a sport that involves people getting into water and using their limbs to propel through the water. Swimmers wear attire designed to help them more through the water quickly. This attire includes swim suits, swim caps, and goggles. Swimmers practice various strokes, including free-style, back stroke, breast stroke, and butterfly. Swimmers tend to practice all of these strokes, but they may excel in one stroke. Swimmers can practice year-round, even when it is cold out! This is because many communities have indoor pools that can be used by members. People without indoor pools tend to only swim in the summer though.
In the passage above, what are the key ideas?
Swimmers wear specific attire, practice various strokes, and usually swim year-round