No sit ups alone will not give you good abs. Sit ups only work one muscle in the abdominal area. You will need to do other core exercises to get perfect abs. Cardio is also very important to help build muscle and reduce fat.
It all depends on how many you are doing, also keep in mind that sit-ups aren't as effective as crunches, crunches will get you abs much quicker... also, you must be exercising fairly frequently...
yes, sit ups foucus on the stomach muscles.We learned this in health and science last week.But sit ups mainly foucus on lower abs. So try a variety of work outs.
If you are talking about washboard abs, then you have to do cardio and usually a good diet helps. If you are talking about just having strong ab muscles, then doing 3 to 5 sets of 20 to 50...