The right arm is thick, indicating that it is strong, so when practicing multi-joint movements such as bench press and push-ups, the right arm borrows more and the left arm borrows less, so the right chest is small and the left chest is big.

Solution:

1. Try to use dumbbells in arm exercises to balance the strength of your left and right hands.

2. When practicing chest, you can use single joint movements to balance the strength of the left and right chest, such as flying birds, straight arms, and tensioners.

3. Try to standardize the movements when doing bench presses and experience the feeling of muscle strength.