Personally, I think it is not necessary. If the purpose of shoulder training is to make shoulders wider, the contribution of deltoid muscle is not great, because it grows slowly, so I suggest you focus on practicing your back, which will be more efficient and naturally look wider.

The deltoid muscle grows very slowly in the natural state, but the deltoid muscle (especially the middle bundle), like the trapezius muscle, has many androgen receptors and is very sensitive to synthetic steroids and sarms.

All the articles and videos you have seen, the models who teach you to practice the deltoid muscles of the shoulder, their disproportionate deltoid muscles, and even the "everted shoulder" wrapped around the upper end of the middle clavicle bundle are all natural talents.

If you usually arrange more bench presses, strength lifts and push-ups, then the anterior middle bundle of deltoid muscle has been greatly stimulated, and it is of little significance to continue to do the training action of the anterior middle bundle of deltoid muscle, which will cause further imbalance of muscle strength before and after.

Moreover, when you do these movements, the shoulder joint also bears great pressure and wear during use.

If you are pushing, the shoulder joint is already under a lot of pressure, so whether you practice deltoid alone in high-weight and low-weight groups or in medium-small and high-weight groups, it will add extra pressure and wear to the joint itself.

This is also the reason why shoulder and knee joints are the most prone to problems among fitness people. Except for incorrect technical actions, in most cases, your use and loss of it are beyond the normal range.