Push-ups are a compound exercise that engage multiple muscle groups in the upper body, core, and lower body. Here's check the what muscles do push ups work:

1. Chest muscles (Pectoralis major and minor): These muscles are the primary movers during push-ups. They are responsible for the horizontal adduction of the arms, bringing them closer to the midline of the body.

2. Shoulder muscles (Deltoids): The deltoid muscles, specifically the anterior (front) portion, assist in the movement of the arms during push-ups. They help stabilize the shoulder joint and contribute to the pushing motion.

3. Triceps brachii: The triceps, located on the back of the upper arm, are engaged during push-ups as they are responsible for elbow extension. They play a significant role in the pushing motion.

4. Core muscles: Push-ups engage several muscles in the core region, including the rectus abdominis (six-pack muscles), transverse abdominis, and obliques. These muscles stabilize the body and help maintain proper alignment during the exercise.

5. Back muscles: The muscles in the upper back, such as the rhomboids, trapezius, and latissimus dorsi, assist in stabilizing the scapulae (shoulder blades) during push-ups. They also help control the movement of the arms and maintain proper form.

6. Serratus anterior: This muscle, located on the sides of the ribcage, is engaged during push-ups and helps stabilize the scapulae by protracting (moving forward) and upwardly rotating them.

7. Scapular stabilizers: Push-ups engage several muscles that stabilize and move the shoulder blades (scapulae). These include the rhomboids, trapezius, and serratus anterior. They help maintain proper scapular positioning and stability throughout the movement.

8. Biceps brachii: Although not the primary target, the biceps brachii (front of the upper arm) are involved in push-ups to a lesser extent, particularly during the lowering phase as they assist in elbow flexion.

9. Lower body muscles: While push-ups primarily target the upper body, some lower body muscles are also engaged for stability and support. These include the quadriceps (front of the thighs), glutes (butt muscles), and calves.

It's important to note that the intensity of muscle engagement can vary based on factors such as hand placement (e.g., wide, narrow, or diamond), body position, and modifications or progressions of the exercise. Additionally, individual variations, strength, and form can influence which muscles are emphasized during push-ups.

Incorporating push-ups into your workout routine can provide a comprehensive upper body and core workout, targeting multiple muscle groups simultaneously.