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Swimming is one of the best activities.
Also if you want to play Racketball, it is fun and a pretty hard workout if you play it hard with someone else.
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skip raquetball and play squash instead, its so much better.
Click on one of the pictures to load a video of squash
better workout and MUCH more fun/challenging. You actually have to think and develop a strategy instead of just hitting the ball hard and low