Static vs Dynamic load on your muscles.
When you walk around, you use different sets of muscles for different motions like moving your legs forward and backward or balancing on one leg as you take a step. As you use one set of muscles, the other set gets a tiny break.
When you’re trying to remain still (standing or holding something in place), you’re likely using the same group of muscles for a long time without breaks. Naturally, this one group of muscles will get tired much faster.
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