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A typical workout for a series competitive swimmer might be between 8000-10000 yards in a 2 hour period, or 320-400 25-yard laps in 2 hours. A beginning obviously will be substantially less.
Swimming the backstroke is a popular form of swimming exercises that involves using the upper and lower body in synchronized movements in order to move forward. Swimming the backstroke is one of the four swim styles regulated by FINA, and may require a high level of endurance and athletic ability at a high speed.