I have been doing dips for a long time now and they start to get too easy. Right now, I can do many reps on traditional dips so the exercise gets a little boring. Therefore, I am looking for a way to make dips more challenging so that I only work with low reps.
I am aware that weighted dip is a solution. But, this is not an option for me, so I am looking for something else.
What I have tried thus far are Archer dips. However, my shoulder joints did not like the movement at all, so this is not an option. And, I made my reps at times slower while at other times faster but progress like this is hard to measure so I am not considering this.
Note that I only want a progression of the dips that focuses on my pectorals alone. There are other ways to make dips harder, like for example, dips in the L-sit position, but this doesn't add more resistance to the pectorals. It makes the overall move harder so I don't want this. Also, it seems that single-arm dips focus more on the triceps rather than pectorals while I am looking for a movement that is dominated by pectoral muscle work.
So what are some dips progressions that I can to do add more resistance and make this exercise harder for my pectorals?