1.  Leg raises.  Lay flat on your back and place your hands under your tailbone to cushion it.  Then lift your legs while keeping your feet together to place a strain on your lower abdominal muscles.  While doing this exercise you should never lift your legs to the point where the strain stops, and you should never allow your feet to rest on the floor.  When properly executed leg raises place a combination of constant tension and repetition on the lower abdominal muscles.
 

2.  Hanging knee raises.  While hanging from a pull up bar you pull your knees up toward your chest.  You want to pull your knees as close to your chest as you can, and try to avoid lowering your legs to the point where your abs have a chance to rest.  Using straps to help support your weight while you do this workout will be helpful.
 

3.  Sitting knee raises.  While sitting on the edge of a bench or chair pull your knees up toward your chest.  It's important to keep your neck and back straight during this exercise so that you can get the maximum results.
 

4.  Rest.  Just like any other muscle group in your body your abdominal muscles need rest in order to get stronger from your workouts.  You wouldn't bench press every day so you definitely shouldn't train your abs every day either.  By training three to four times a week with at least one day off between training days you can give your abs the time they need to recover which will give you better results.
 

5.  Resistance training.  In order to truly show the results of the intense abdominal workouts you are doing you will need to reduce your body fat.  Engaging in resistance training with an emphasis on light weights and high repetition will help you to build muscle tone and reduce body fat.
 

6.  Aerobic training.  Much like resistance training, aerobic workouts are a key component of cutting down body fat which will allow your abs to show.  By using intense aerobic training in conjunction with your ab workouts you can get the results that you want.
 

7.  Diet.  The last, and possibly most important aspect of any fitness program is diet.  When your goal is to get a six pack then you need to diet with that goal in mind.  A diet such as this needs to be very high in lean protein, with low levels of fats and carbohydrates.  You can spend hours in the gym, but if you are fueling your body with foods that are bad for it then your results will leave you less than satisfied.  Getting a six pack isn't easy, but by following these 7 secret tips on how to work out lower abs you can at least take the guess work out of how to get the results that you want.