In weight training, there are different systems that should be used based on the ability and needs of athletes.
Let's take squat as an example. In this exercise, you may be able to lift the maximum weight of 155 kg, and in this case, you can probably lower the weight of 160 kilos slowly with control.
That is, our body acts stronger in the lengthening contraction, which is eccentric and plays a role in going down, than in the shortening contraction (concentric phase), which plays a role in going up.
According to this principle, we ask the athlete to use a very heavy-weight load and put strength first. In the concentric phase, they may apply assistance to perform load but in the eccentric phase, they need to do self.
This system is only used for experienced strength athletes.
