Do you use waist support during strength training? Like when doing squats?Let’s cut a long story short, heavy Weight training are required, but lighter training are not .  
 
But how do you define what is a “heavy or lighter training “?   Let’s leave it for now,we will talk about it later .In actual training, how to use waist support needs to consider some specific factors according to the training situation, that’s why it can not be generalized.  After we finish the discussion, we’re going to revise this rather rough answer.  

Waist support ,what action do it have for human body?
Waist support, it is made for protect the waist , usually also known as “waist support belt”.  Just like the name tells, its role is to protect the waist and reduce the risk of injury, But that’s not all it can does.
 
For those friends who using waist support,they must know that in strength training, especially during do deep crouch or hard pull , waist support is able to let the person doing exercise feels more powerful and even Increase strength level.  In poses such as standing barbell push, the waist support is more significant for improving the stability of the waist.  
 
This is because wearing a waist support can support muscles，but also can promoted the abdominal pressure of exerciser, make upper body have better stability.  Can let us pull up or lift bigger weight, in other words ，for the same weight, after we wearing waist support will feel more relaxed.  
 
Of course, the stability of the upper body can also better protect the spine.  New bodybuilders often like to pursue larger training weights in the initial stages of strength training, such as the barbell squats mentioned here.