It takes years to learn the “tricks of the trade.” I learned this trainer trick when I worked at a performance enhancement facility. The main goal of any ab routine should be to do as much (and for the longest time) possible.
The “old school” way, is to do one set of any ab exercise and then rest. However, you will get the best results if your try to combine 2 or 3 exercises in a row. Then follow this mini circuit with a rest period. Next repeat your circuit 2-3 times. As you get in better shape you can add an additional exercise. This will “burn” really bad at first. Overtime, you will feel your abs change and get stronger.
(CES, PES, CPT, BS)