muscles shake as they get tired,or are needing fluids etc the shaking is natures way of telling you to back off thats not entirely true. muscles can shake from the second you start an exercise. it's actually just your body telling you that they're not used to this movement. if you continue training those muscles over time the shaking will stop. expect to be sore the next day though :)
The role of a protein shake in exercise is simple - when you rip your muscles during exercise, they need a supplement of protein to grow back to its original, or even larger state, for some a turkey sandwich is sufficient, but for others a protein shake is quicker and more efficient...
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.
No. The shake weight is a physical activity and not exercise.
Straight after exercise
Well yeah, as it's dancing (I think...) which is good exercise.
they are loosening up their muscles
You have depleted the energy reserves of your muscles, but that's a good thing, since it trains the muscles to be more efficient, forces your body to build muscle tissue and helps your cardio system become more healthy. Keep it up, it's good for you.
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.
Your muscles quiver (shake) when they are cold. Shaking increases their temperature.
sternocleidomastoid, splenius capitis, semispinalis capitis