An individual who swims for longer distances in shorter amounts of time each day is improving their: endurance and body composition only. flexibility and endurance only. flexibility and strength only. endurance, body composition and strength.

The correct answer is  : Endurance, body composition, and strength

- Since swimming is some sort of cardiovascular activity, it will increase their endurance
- Doing longer distances with shorter amounts of time will increase the exercise's intensity, which is very good in burning body fat, which will improve their body composition
- Swimming will train the muscles in their upper body, which will increase their strength 

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You would modify how often you work out in reps and sets and also modify calorie intake