In recent years, there has been a surge of interest in eccentric training, either in the form of supramaximal, eccentric-only training or in the form of eccentric overload training. There are now many technologies available that allow eccentric training to be performed for many common exercises. Yet, concentric-only training is also a valid method for producing strength gains and hypertrophy, and it has its own advantages and disadvantages, in much the same way as eccentric-only training.
<Source: Patreon>