Underhand is where your hit the ball by reaching forward underneath it. Overhand is where you hit the ball above your head. Which one you use would have to depend on where you are relative to the ball. If it is above your head, you will have to use overhand (maybe you will have to jump), while if the ball is going to hit the ground in front of you, you will have to use the underhand hit (and you may have to dive for it).
of course you can!. . .
underhand, overhand, and jump serve
block, set (volley), bump(pass), serve (underhand and/or overhand),and spike
Two ways to serve are underhand and overhand. To serve underhand, hold the ball in one hand and hit it upward with the other fist or forearm, so the ball flies in a parabola into your opponents' side of the field. To serve overhand, toss the ball above your head and then smack it with your wrist, palm, or fingers to send the ball over the net in a parabola flatter than the underhand serve.
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== == == == Usually not... but you can if the coach prefer you to also, it depends on how old you are. if you are still jv then it isn't as crucial that you do it overhand
I would recommend lifting objects underhand to reduce strain on the elbow. Overhand lifting can put more stress on the tendons and worsen symptoms of tennis elbow.
its more difficult than an underhand serve because you throw it in the air and try to hit it. its more easier to do an underhand serve because you hold it your hand rather than throwing it in the air. its more dangerous because it goes in a faster speed than an underhand serve.
personally, i find overhand really hard, I've yet to get it over after two years of constant practice, but i can get my underhand over easy as anything, so it just depends on what your good at :) personally, i liked to learn underhand first :P
Overhand (throw the ball up, take a step forward, and hit it with your opposite hand) Underhand (hold the ball in one hand, take a step, then swing your arm like a pendulum with a fish and push it out of your hand) Float (same as overhand, but freeze your hand once you hit it instead of following through) Jump (step forward, throw the ball up in front of you, take one last stride, then jump and hit the ball as it is descending) Top Spin (the ball spins forward) Side Spin (the ball spins sideways)
a spike
Underhand serve