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Standard situps generally work the hip flexors over the abdominals.
Try doing "mermaid flops" by keeping your ankles together, knees slightly bent, fists under your ass to keep your back from grinding on the ground... and simply raise your feet from about six inches above the ground to around twenty-four. Repeat this up-down controlled motion leg lift exercise until muscle failure four times with short breaks.
Try it with boots or ankle weights for an extra challenge.
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