Our expert says:
Not necessarily, to answer your first question. Obviously, if you do exercise that involves the muscle, the muscle will develop, but I don't think this is the same thing as what you're aiming for. So perhaps you need to avoid high resistance training with the quads/thighs, and maybe aerobics is not the best for you, but over time, it won't keep making your thighs bigger and bigger.
The weight training is much more likely to cause your thighs to develop, especially if you're squatting what is pretty close to body weight. That's quite heavy, and if you're really interested in toning, that may be too great, and maybe you need to reduce that and lift more reps. Say 40kg, but do more reps than before.
Other than this, it's a question of doing more cardio and giving it time - it's never easy to target one area, and that area is always the last to change, so it's going to be a longterm challenge!
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