I am thinking outloud here of something I think would be cool, currious if anyone else sees this as super cool.
So I as well as others here feel, Coach Jack is super cool and powerful (seeing how much use it gets each day it feels “popular”). What I see is lots of options now but also lots of ways you might want to create totally customize plans. As an example you could crate a few different coach Jack plans or even create custom plans using existing workouts or plans and merge them together into a single plan.
Just select the weeks you want from one plan and insert the into an existing plan. This is not Coach Jack specific but seems like this could make Jack plans 100% customizable, with months like December being totally different.
Below is how simple it would be to do this.