there are two situations: the personal posture is correct. The reason why the triceps muscle is struggling is that the triceps muscle is less trained in normal times, or the triceps muscle is not struggling in normal times, and the action (for chest muscle training) mainly focuses on the triceps muscle (short board effect). Other muscles should be stronger < P > Personal posture is incorrect. Causing triceps to work harder than usual! ! ! Increased the burden on the triceps! Therefore, it may take a long time for the triceps to work hard, while others may not work hard < P >, and triceps training is less likely to cause it.