The arms of the upper arms tend to weaken by all means, and the meat of the upper arms often sags. If there is a lot of subcutaneous fat in the upper arm, not only will you feel slack, but the upper arm itself will become thicker. If you want to make your upper arms thinner, use a diet that allows you to use more fat around your upper arms.
In a diet that only loses weight, it is important to be aware that the second arm may increase in slack. Even if you lose weight, it is important to do muscle training in order to prevent the slack in your upper arms from increasing. The muscles in the upper arms are used to create a support so that the skin does not sag, so it may not be necessary to have a bruise.
It is a dumbbell that is useful for the diet of the upper arm. It seems that some people will try to do it if their arms become too thick due to muscle training, but doing so on a two-arm diet does not make the muscles so strong. If you are training your arms for the purpose of dieting, the amount of muscle will not be so much.
It is a diet, even if you only hold the dumbbell firmly and exercise slowly like pendulum exercise. The point when you want to do effective two-arm exercise is to be conscious of doing a slow motion so that you do not get speed when you shake your arm backwards. By continuing the exercise to strengthen the muscles of the upper arm every day, even those who are anxious about slack can shape up the upper arm.