Rectus Abdominis
Deltoid
your gluts, abs, and your intogalactibal muscle.
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Abdominal
abdomen
the abdominal muscles
Sit-ups will most benefit your abdominals and thigh muscles - as those are the groups doing most of the work.
Very little energy is used in waking up, which a change in the mental state. However after waking up we usually stretch or sit up, and that uses mechanical energy from the muscles.
tiens-toi droit is the French equivalent of 'sit up'. The sports exercise 'sit-ups' is called 'les abdos' (after the belly muscles 'abdominaux')
Everyone needs muscles; without muscles, you would not be able to complete any task, from running a marathon to even typing this question. Without muscles, you would not even be able to breathe; your heart would not beat. You would not even be able to sit up. Muscles are used for EVERY action, and are even used when no action is happening. Thus, everyone needs muscles.
without muscles your body would not be able to work. you would not be able to do anything not even sit up or go poop.
your gluts, abs, and your intogalactibal muscle.