It is mostly technique, although some strength never hurts. Fast and/or heavy balls don't come from being strong like many of us think about it (being able to bench a lot, lift a lot of weights, etc). Instead, they come from generating a lot of racquet head speed on contact. This can be increased a lot through proper technique and relaxation of the muscles during your swing so that you are holding the grip pretty loosely and allowing the racquet to "whip" through the ball.
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