Anyone who's been working out for a while knows that abdominal muscle training is the hardest. It requires lowering your body fat percentage to below 10% and doing many different targeted abdominal exercises. Most people, however, only do moderate-intensity crunches. The result is that their abs aren't well-defined or aesthetically pleasing.

To develop a six-pack like a fitness enthusiast, you need to vary your abdominal exercises to stimulate the muscles from different angles. You should also gradually transition from low-intensity crunches to high-intensity exercises like hanging leg raises and Bruce Lee's dragon flag.

If you want to achieve defined abs, you need to maintain at least four 30-minute cardio sessions per week, combined with high-intensity abdominal exercises. The following 10 exercises are what you should aim to achieve.

Exercise 1: 15 repetitions to each side, 2-3 sets

Exercise 2: 15 repetitions to each side, 2-3 sets

Exercise 3: 15-20 repetitions, 2-3 sets

Exercise 4: 15-20 repetitions, 2-3 sets

Exercise 5: 15-20 repetitions, 2-3 sets

Exercise 6: 15-20 repetitions, 2-3 sets

Exercise 7: 15-20 repetitions to each side, 2-3 sets

Exercise 8: 15-20 repetitions, 2-3 sets

Exercise 9: 15-20 repetitions, 2-3 sets

Exercise 10: 15-20 repetitions to each side, 2-3 sets.

If you can complete the above exercises correctly and maintain a body fat percentage of around 10% for a month, you are guaranteed to develop perfect and attractive six-pack abs.