Our expert says:
Walking in general does not cause fingers to swell, however, drinking too much fluid can cause this problem and swollen fingers are a common sign of fluid overload.
In general, you should not need to continually sip water during a 5-7 km walk, as your body has adequate fluid reserves to sustain your fluid needs for that distance. Bend your elbows about 90 degrees and swing them naturally to assist veous return to your heart.
Drinking too much fluid during exercise can severely dilute body sodium levels to dangerously low levels - causing death in some cases - so drink only when you are thirsty and leave the water bottle at home or in your car for when you finish.
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