Also, when targeting big fish like sharks it is impossible to fight them with only the reel, so you fight it with the strongest part of your body, your legs!
You walk back a ways to win some line and then run towards the water reeling in like mad to win back some line.
You will also see them kneeling every now and then while walking backwards or forwards, that is like anchoring yourself and putting serious stress on the fish to try and turn it.
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