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The atissimus obrsi abdominals is the prime mover in a sit up.
A sit up is an eccentric muscle contraction.
by doing various exercises such as sit ups and running and u can go to the gym
You can't, fat do not turn into muscle; they are two different things If you want a visible abs, you have to lose the fat (doing cardio, eat less fatty food), and build more muscle by doing weight resistance (and eat more protein)
you can make your upper body more muscle by doing sit ups bench press push ups or any thing like that
The gluteal muscle.
Pretty much only abs, if you're doing them correctly. If you're doing it wrong, tights and arms might be worked too.
Biceps, Triceps and the lats mainly. Also Muscles found in the lower back and the thighs
Do lots of sit-ups and crunches Okay no. All that will do is build up your layer of muscle. Your stomach goes... Muscle, fat, and then skin so by doing crunches and sit ups all it does is make your abs bigger. Not burn fat. By doing this u will ultimatly end up looking bigger than before.
The rectus femoris THe regular Muscle Action is hip flexion with knee extension, as in kicking a ball or doing a straight leg raise The reverse muscle action is still hip flexion with knee extension, but as in doing sit-ups while lying supine with knes straight ahead
your gluts, abs, and your intogalactibal muscle.
Usually boys have more muscle mass than girls, but I did once see a women put the men to shame in a competition by doing 61 sit-ups in a minute (i'm male, by the way).