Cycling, sometimes referred to as periodization, is the concept of structuring your training around different phases throughout an exercise program. Most recreational exercisers do not utilize this method although it can greatly increase gains as well as guard against injury.
Working on that six pack is a very popular goal. Every fitness magazine out there has a new routine on the cover of each issue. What is always lacking is a better understanding of what the core is actually supposed to be doing and how it contributes to strength.
I just read an article on T-Nation in which the author expressed his opinion that corrective exercises are a load of bull. People’s problems are that they are weak, period. I have to say I agree, however, I think correctives have a place, it just depends on how you think about