We put this on the list because of how easy it is to manipulate the degree of difficulty. If a regular plank is too easy for you, lift an arm, or a leg—or an arm and a leg. Put your feet into a TRX and give that a whirl. Still too easy? Take your feet out, and put your forearms in. Each one of these progressions leads to a greater training stimulus to the abs.
Lie face-up and place your lower legs on a Swiss ball. Extend your right arm overhead and bend your left arm at a 90-degree angle; then grasp the upper portion of your right arm so you form a cradle for your head. Flexing your toes and holding the ball in place by contracting your hamstrings, crunch forward to the finish position. In this position, increase the tension on your abs by attempting to pull the ball towards you with your hamstrings. Return to the start and exhale. Your rectus abdominus can flex only about 30 degrees (strictly), so when you perform this exercise it may not be necessary to lift your shoulders off the floor to achieve peak contraction. You can make the exercise more difficult by pulling harder with your hamstrings, maintaining peak contraction longer and by holding a weight in your free hand.
This exercise will stretch many of the muscles responsible for posture that are sometimes tight and it strengthens those same muscles if they are weak. You may discover that when you first perform it, one side of your body is significantly stronger or tighter. For instance, a long-time discus thrower who has turned to his left for years, to initiate his throw, may have significantly stronger obliques on his left side.
Contrary to what popular culture portrays, one does not need to lift really heavy if muscle hypertrophy, aka “bigger muscles” or aesthetic gains are the primary goal (see bodybuilding vs powerlifting). One needs to ensure that a particular muscle is subjected to enough time under tension and training volume to ensure that muscle fibres are broken down and rebuilt stronger over time. This can be done by following a high-volume, moderately high rep range, moderate weight and low rest period lifting routine. I start off with 5 sets of a heavier compound lift eventually moving to isolation exercises. I started off with the popular ‘3 sets of 10’ for isolation exercises, then to 12 and now hit 4 sets with the rep ranges 15,12,10 and 8. Higher reps would mean a lighter weight and vice versa. My last set is almost invariably a dropset. I hit around 15 -18 working sets per muscle group per week.
The crunch is the most popular abs exercise because anyone can do it. But that doesn't mean it's the best exercise for training your middle. "Crunches flex your trunk," says David Jack, owner of ActivPrayer in Phoenix, Arizona and creator of Men's Health MA40 Workout. "But the main function of your core is to prevent movement and resist force through your torso."
In addition to this, you must also avoid sugary products (pastry, candy bars, coke etc), as sugar has a series of negative effects on your health, and it also contributes to belly fat which is the most difficult to get rid of! Of course you will be tempted now and again so have a cheat day once a week when you can have your favourite “bad foods” but don’t go too crazy!