If you are looking for the best ab exercises, then those involving your own body weight are usually the best, although going to the gym and using a machine such as the Captain’s Chair is very effective as well in strengthening the core and slimming your waist.
If you are looking for a workout schedule for men this is one of the most recommendable because it focuses each day on different muscle groups and thus encourages progress and increase in muscle mass; moreover, it avoids boredom because you do something else each day.