How fast muscles get tired vary from person to person. It will vary based on the persons activity level, how hydrated they are, as well as how much muscle mass they have compared to others. While some peoples muscles won't get tired too quickly, others who aren't very active may get tired quickly.
it could just mean that your growing to fast and your mucsles arn't used to your body yet
a lot
they can swim as far as 50 km an hour and faster than a cheetah
YOUR BRAIN REACTION,YOUR muscles, tired or no tired,even weather.
17, not including their vagina mucsles. if it is as big as your moms vagina then they will have 92 total mucsles.
mucsles
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when you get tierd
32 exact
Pregnancy, get tired fast.
Cus he's unfit
The jaguar runs fast because its fast and it's legs are using strength until it gets tired