Understand the structure of the human body? Which muscle is stressed? It's a way to train muscles. I can briefly introduce a few points to you. as follows

Now, there is no auxiliary training equipment? push-up

At the gym? 1. Can you use a barbell? Flexion and extension of the arm

2, sitting posture, one-arm dumbbell flexion 3. Slant rope flexion and extension 4. : sitting posture, holding the bell with both hands, flexion and extension.