Rectus abdominus Internal and external obliques Transversus abdominus.
The gluteal muscle.
your gluts, abs, and your intogalactibal muscle.
well, your biceps longus is the muscle on the top of your thigh. You engage this muscle when you lift it while in the sitting position. the , once the leg is crossed, it is gravity that keeps your leg in place. ( I think :) )
ur abs
sartorius
Technically speaking it's the abs. The agonist muscle in a situp is actually the hip flexors.
Because you sit on it everyday!
The prime mover during sit-ups is the rectus abdominis muscle. This muscle, commonly referred to as the "abs," contracts to flex the spine, allowing the torso to lift towards the knees. Additionally, the hip flexors assist in the movement, but the rectus abdominis is the primary muscle responsible for the action.
In a sit-up, the primary agonist muscle is the rectus abdominis. This muscle contracts to flex the spine and bring the torso towards the thighs. Other muscles, such as the hip flexors, also assist in the movement but the rectus abdominis is the main muscle responsible for the action.
the abdominal muscles
erector spinae for spinal extension and quadratus lumborum for spinal abduction
A sit up is an eccentric muscle contraction.