Back muscles: Squat down, press your feet, put your head in your hands, and lift your upper body. I can't remember exactly what this name is.
Deltoid: Use dumbbells and put your hands on both sides of your legs. There are three ways: 1, lift both sides horizontally. 2. Lift forward. 3. Lift it aside. Then the barbell, but it takes up a lot of space. ..
The arms are divided into biceps brachii (inside) and triceps brachii (outside), dumbbells, push-ups and weights.
Chest muscles: supine press, barbell or dumbbell
Pay attention to the fact that the upper arm should be perpendicular to the ground when doing push-ups; When putting down the barbell or dumbbell, you should stand 2~4mm away from your chest, stand with your shoulders tilted down and your feet firmly on the ground.
Hope to adopt!