Nothing short of surgery or gaining body fat can actually increase the size of your breasts. As for making them look bigger, well, that's why the chunk of change we spend on bras each year is larger than the GDP of Iceland.
Push-ups and padding aren't your only options, though. Developing the muscles underneath your breasts will enhance the look of your breasts and make them appear larger.
Let's be honest: This workout won't turn A cups into Bs or beyond. But if—like most women—you rarely train your chest, then you're missing out on a natural way to add a little extra oomph.
Start on all fours, your palms slightly wider than your shoulders, feet close together. Your body should form a straight line from head to toe (A). Lower down until your chest almost touches the floor. Keep your upper arms at a 45-degree angle to your torso (B). Pause, then push back to the starting position. Do 10 pushups and rest 90 seconds.
Sit on an adjustable bench set to a low incline (about 15 to 30 degrees) and place your feet flat on the floor. Grasp two dumbbells and hold them up above your shoulders, arms straight (A). Slowly lower the weights down to the sides of your chest (B). Pause, then press the dumbbells back up toward the ceiling. Do 10 reps, then go to move 4 without rest.
Lie faceup on a flat bench with your feet flat on the floor. Hold a pair of dumbbells above your shoulders with your elbows slightly bent (A). Keeping the slight bend in your elbows, lower the weights until your elbows are even with your chest (B). Keep the same bend in your elbows as you press the weights back up. Perform 10 reps. Rest 90 seconds.