![]() ![]() You engage your abs, drawing your chest closer to your hips and lifting your shoulder blades off the bench. The movement is more productive because it reinforces abdominal activation. In contrast, sit-ups have you lift your torso entirely off the bench and into an upright position.īoth exercises are similar and train many of the same muscles, but crunches tend to be the better option for most people. The goal with crunches is to engage your abs and raise your upper back a few inches off the bench. Sit-ups and crunches might seem like the same exercise, but they are different. Difference between the Decline Crunch and Decline Sit-up Their primary function is to flex isometrically and offer torso support. The transverse abdominis, obliques, and erector spinae also play a role during a decline crunch. ![]() As we engage our abs, the muscle produces the force we need to crunch from a decline position. One of the muscle’s primary functions is to draw the chest closer to the hips ( 1). The primary muscle that works during a decline crunch is the rectus abdominis, which runs from just below the ribcage to the hip bone. What muscles does the decline crunch activate?
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