There are quite a few reasons why weak muscles might shake. These muscles could just be spending the last of their energy.
The lips may shake when they are tired because the facial muscles may be tense. Tense or tired muscles may shake or tremor.
yes
Weak muscles.Protein deficiency can lead to weak muscles.
Weak muscles, lazier.
If you had no muscles, you'd be weak! Muscles are very important and if you're too weak you could get ill!
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Strengthen weak muscles and stretch shortened muscles.
When you squeeze your muscles really hard (like in a stunt) your muscles may shake because they're working so hard. It's totally normal, it happens to everyone.
Bobo weak
Your muscles quiver (shake) when they are cold. Shaking increases their temperature.
Greek geek
If you are ill for a long time, your muscles can become weak and atrophy can occur.