But I think that's my major issue with the app as I understand it.

Starting by choosing which muscle to work is a really odd choice. If you're novice enough that you don't know which movements to choose then you're also likely to not know which are the most effective muscles to target for your goals.

Then the app gives you a bunch of exercises to target that one muscle, but doesn't tell you which other muscles the exercise also targets. Or any clues on suitable weights or rep ranges, never mind progression. It also seems it's suggesting doing all the suggested movements. I picked barbell and pecs and it gave me three exercises. Then, even more weirdly, I came in again to write this comment and selecting the same options it gave me a different set of three exercises. First time around it didn't even suggest barbell bench press - the most obvious and common exercises for that muscle and equipment. That's all really confusing and un-obvious.

Being able to pick a template programme and tweak from there seems a much friendlier way of getting started.