Triceps are an important muscle group in the upper arm area. Thus, incorporating exercises which tone and condition the triceps will also help effectively reduce the appearance of saggy, loose skin, especially around the armpits. One good way to do so would be by using any form of hand weight, or, even some make-do weights present around the house to do so.
How to do:
-Stand upright, with your feet and shoulder, width apart. Hold the dumbbell directly above your head with your arm extended.
-Clasp your elbow with the other hand for support.
-Now, fold your elbow so that the dumbbell is lowered behind the head.
-Extend your arm back to the starting position.