First of all, you should know that when you are practicing chest muscles, you will use triceps when doing flat, oblique and downward bench presses, which will make the barbell reach the highest point. And triceps are more prone to fatigue than pectoral muscles (often you feel that triceps are not strong enough to support you to do a complete bench press when your pectoral muscles are still strong).
If you exercise your arms first, you may not be able to train your chest muscles. So it's best to have large muscle groups first, and then small muscle groups. The same is true of other parts. Can combine back and biceps, chest and triceps, deltoid and abdominal muscles. You can also use the principle of antagonistic muscles to train two muscle groups with opposite strength, such as chest and back, two heads and three heads together. Shoulders and legs train together. This can not only train one part, but also stretch the muscles of another part.
Fitness is a step-by-step process, and it can't be done overnight, nor can it be done overnight. In your training, you should change the training action, training sequence and training intensity at any time to better stimulate your muscles.