When approaching depth progression there are mainly two types of training cycles depending on the duration of our cycle. Ladder training, also known as linear progression training and Pyramid training, also known as cyclical progression.
A squeeze is essentially a damage or injury to the lungs or trachea as a result of the effects of increased pressure on the closed gas spaces of the lungs during breath-hold diving. Medically, it is known as lung or trachea barotrauma.