Although both are for abdominal work out, they have differences. Leg raises targeting abdominal muscle alone , while sit-ups you are working out multiple joints including muscle on hip, knee, ankle, and core muscle group which are abdominals, back, diaphragm, and pelvic floor muscles.
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Performing leg raises will work your abs, particularly your lower abs . You could improve the effect by adding ankle weights to your legs while doing the leg raises. While leg raises will help strengthen and define your abs, it’s still not a complete abdominal workout.28 Eki 2018
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