Reduce overall body fat with a calorie deficit
Do regular full-body strength training
Include upper-body exercises like push-ups, rows, chest presses, and shoulder presses
Train the back, chest, shoulders, and arms consistently
Add cardio such as walking, running, cycling, or swimming
Improve posture to reduce the appearance of armpit bulge
Wear properly fitting bras and tops
Build muscle in the upper body for a more toned look
Stay consistent with diet and exercise
Get enough sleep and manage stress
Consult a doctor or trainer if the area is painful, swollen, or unusual