Usually when fitness mania successfully complete a set of exercises, he is still able to continue the next set, though his strength is no longer as much as the previous set. Even if the practice is done to failure though, usually he is still able to do some more sets in the future. What happens here is an unfinished process of muscle recovery, but it's enough for you to do the next job with less power. This zigzag exercise is designed to rely on the muscle recovery process, in order to maximize the intensity of the whole exercise.
preliminary

In the traditional exercises that many beginner   do, they usually do several types of exercises in sequence, without repeating the exercises done before (except circuit-style exercise). For example: to train quadriceps, you start with some squat sets, then go into leg presses, then maybe proceed to hack squat, leg extension, etc. And when you do, you usually will not go back to the squat again. In a zigzag exercise that happens just the opposite, you are advised to return to the squat or whatever your initial training before. The following is a description of the explanations and mechanisms that work behind this zigzag technique.
Traditional Exercises

Chest-training

If the exercise is done very hard, chances are your muscles will be tired to the extent that you are difficult to continue the next similar exercise. Usually your secondary muscles will be exhausted if doing compound type exercises. For example, biceps exhaustion when doing seated cable rows and lat pulldown. Triceps exhausted when bench press. To outsmart, usually bodybuilders do the compound exercise first new end with isolation exercises.

In many ways, the main cause is usually not because of secondary muscle fatigue, but the primary muscle. One possibility is this: a failure condition of one part of the muscle of many muscles in the muscle group, or to one part of the muscle (eg one large muscle wedge in quadriceps). Let's discuss one-on-one.

To exercise one particular muscle group (eg quadriceps), you usually do one type of exercise in several sets until failure. Usually the first failure is Vastus Lateralis, leaving little power on Rectus Femoris to practice leg presses. Or during the practice of hack squat, then Rectus Femoris will fail first rather than Vastus Lateralis. If faced with such a situation, it will often make fitness mania feel not confident to continue the practice.

Something similar can happen to a single muscle such as biceps or triceps. But the rate of failurenya is usually not as big as the muscle groups as discussed earlier. For example: when doing tricpes extension, then the failure first is medial and long part rather than lateral part. The lateral part of the triceps muscle still leaves power for later exercises that use much lateral muscle, a high pulley rope extension. But the same psychological effect, failure in one part of muscle, will make fitnessmania not confident when entering the other muscle part training. Too already.
The zig-zag solution

Intensive-trining

The way to do it is the same as discussed above, but when it comes to going to the phase of failure soon, move on to another type of exercise focused on the other muscle parts that are still in the muscle group, or the different muscle parts altogether. Then back to the original exercise. So assuming you do 2 different types of exercise that hard in the first set, then in the second set and so on will decrease slightly due to the process of muscle recovery (not enough time). Because the exercise continues when the recovery process is in progress, it will automatically increase your chances of making your muscle a total failure after the fourth or fifth set.

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Furthermore, for the same muscle, considering the amount of muscle fibers in it, there are about (at least) 3 different muscle fiber areas in the same muscle. In order to exercise you can with at least 3 different types of exercises for the same muscle. And for that purpose, this kind of zigzag technique will be very effective. It's more like a superset.
Direct practice

Take for example leg training, leg press and hack squat. Perform 3 sets of leg press, followed by 3 sets of hack squats, followed by 2 sets of leg press and last 1 set of hack squats. If you are observant, the practice program adheres to the principle of 'Declining Pyramid'. The reason you are trying to reach the phase of failure in the trained muscle. In the example there are only 2 types of exercises, but if you want to beat 3 different muscle fiber areas of the same muscle group, try at least 3 types of exercises with a decreasing pyramid princip