Kegel exercises strengthen the muscles of your vagina and have no affect upon your labia, masturbation has no affect upon your labia either.
Yes. Generally, kegel exercises are also known as pelvic floor exercises. They are very useful for strengthening your pelvic floor. Also, those kegel exercises are a great form of discrete exercise that you can do at any time, you can do those exercises alone, you can do them whether you’re waiting for a train, you are lying in your bedroom, or while you are watching TV. There are no rules. But, you should learn on how to exercise the right muscle group. Many women mistakenly tighten their anus, stomach, and core, rather than their pelvic floor. I am aware that kegel exercises for women are hard to learn, but you can always ask someone for the advice.
Bobbie_P is correct. Kegels won't affect your labia, but they do tone your vaginal muscles. Doctors recommend doing kegels daily. Toned vaginal muscles help when you are ready for child birth. They also help prevent incontinence. Also, most guys like feeling a tight vajaja. Plus, during the act, you can also give his penis a squeeze. Guys go crazy over that.
Doing kegels is easy to incorporate into your daily routine without taking up any real time. Waiting at a red light? Squeeze out a few reps. Waiting in line to check out groceries? Squeeze again. No one will know.