This article is meant to simplify calisthenics training, guide you from beginner to advanced, and show you how all levels can use your body as a paintbrush to create a masterpiece.
Someone who is strength training should have the flexibility to go on a weekly run and remove a day on the weights. That's heresy to some coaches who want to keep you in the gym.
Biceps don't get much isolation time in functional fitness workouts but it's cool to show them some love. Nothing wrong with well-developed arms and they do look good, there's always that.