A rock hard core is one of the defining attributes of peak fitness. And on top of that, they bring the hotness. We all want them. But so many people out there either don't have the motivation, or they don't think it's possible for them. We'll I'm going to tell you it is possible, and with a proper training plan, motivation won't be a problem.
Most people that would love a rock hard core treat training as something to be done if there's extra free time. And this is why so few people reach their fitness goals. There is no way around it unfortunately; you need to expect some discomfort when you hit the gym. And this is a strong deterrent to regular training. If you leave your workouts as an afterthought to work and play, your body will show it.
Those people that do have rock hard cores and beach bodies don't treat training this way. They think of it as part of their schedule every day. It isn't a thing to be done when they have free time; it's a necessity that comes first. If you aim to work out at the same time every day, or perform your workout first thing in the morning before anything else can creep in to distract you, your chances of success will rise exponentially.
Once you've taken care of motivation by building training into your lifestyle, the next step is the training program. Your core is used in almost every action, and your abs are designed to stabilize the body. If you're focused on a six pack, the meat of your training should be large compound body movements that stimulate muscle growth and force your body to burn calories. These exercises are the basics, pushups, squats, pull-ups, and crunches.
If three mornings a week you wake up and perform a continuous circuit of these four exercises, doing each one until you simply cannot perform another repetition, and then move on to the next exercises for a total of 2 or 3 sets, your metabolism will be sky high. This is a total body workout that takes less than 10 minutes, but believe me, it'll feel like you've been in the gym an hour. If you do this Monday Wednesday and Friday, use Tuesday and Thursday to run. Run for less then 25 minutes, first thing in the morning. At least 3 times throughout this run try to sprint for about one minute.
Simple bodyweight resistance training, just like they use in the military and good old fashioned running is all it takes to cut up the midsection and give you a sexy six pack. And all this can be done in less than 2 hours a week, less than 25 minutes a day, 5 days a week. On top of this you should eat to support your goals. Consume sufficient lean protein, unsaturated fats, and complex carbs to fuel your daily needs, but reduce trans and saturated fats, and try to avoid white carbohydrates like pasta, sugar, and bread. What will your abs look like in thirty days?