Thunders is another PE site. SO = straight out, SD = straight down, and SU = straight up.
I think you are understanding the routine correctly. After a total of 18 workout days. As remek said, if you have gained you will
want to do another week to "cement" your gains and then take a month off. This routine may seem "slow" but it is designed to keep you from
hitting a plateau and your gains coming to a halt.
If you are finding this routine difficult follow you might want to start with this one.
Your First Penis Enlargement Routine - Penis Enlargement Gym