If you want a quick fix, try exercises with dumbbells. This will not only increase the tone of your arm muscles, but also help to reduce armpit fat. Check video and our article to find out best tips on how to get rid of underarm fat. Skipping rope is a great exercise for armpit fat. It's easy to do, it will reduce sagging and give you the strength you need to fight your arms. Be sure to consult your doctor if you are experiencing pain in the armpit area.Push-ups are another great exercise to combat armpit fat.