Try arm exercises to build muscle after 50, a daily plan designed by Jarrod Nobbe, MA, CSCS, using bands and bodyweight.
Try standing exercises to fix arm jiggle after 50, a band routine with expert tips from Karen Ann Canham, a certified trainer ...
I will give this disclaimer every single time someone asks me what exercises they can do to reduce or eliminate armpit fat. The disclaimer is this: The idea that you can “spot reduce” fat is a myth.