My friend, as a fitness instructor, I can tell you responsibly that if you want to practice right-angled shoulders, you can go far mainly by dumbbells and single parallel bars! Practice 3 groups of dumbbells every morning and evening, with 30 beats in each group, 20 in each group for the horizontal bar pull-ups, and 20 in each group for the parallel bars! In this case, it should be about 1 month, and the right-angled shoulder will be formed! There will be a completely right-angled shoulder around 2! I wish my friends a happy National Day, success and all your wishes come true! Please choose my answer as a satisfactory answer!