The best way to do inclines is to use a smith machine, because it helps you focus more on the targeted muscle. One study from Illinois State University (Normal) reported that when subjects performed free-weight presses, they used more front- and middle-delt muscles than during machine presses. The researchers reasoned that this is likely due to the need for the deltoid muscles to stabilize the shoulder joints to balance the bar when pressing a barbell. Because the machine is on a fixed path, the shoulders don’t need to stabilize the shoulder joints. Less involvement from the delts means you can place focus more on the pecs for greater muscle growth.
Thank you, Emeric. Excellent advice as always