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Following are the Components of Physical fitness :

1. Speed: Speed is the ability of a person to execute motor movements with high speed in the shortest period of time. It is equal to the distance covered per unit of time. the element of speed is involved in most of the athletic skills such as in sprint running, some skills of soccer, basketball, etc.

2.Strength: Strength is the ability of a muscle to expert or release force by contraction enabling a person to overcome resistance or to act against resistance.

3. Power: Power is the ability of muscle to release maximum force in the shortest period of time. It is equal to force multiplied by speed. It is the combination of strength and speed. Speed and force must be combined for effective performance in activities like baseball throw, jumps for height, football kick, boxing punch,etc.

4. Endurance :Endurance is the ability of the person to perform movement of moderate (Sub-maximum) contractions over prolonged period of time under conditions of fatigue or tiredness. It is the product of all psychic and physical energy of human body.

5. Flexibility : Flexibility is the ability of a muscle to perform movements with large range of motion.

6. Agility : Agility is the ability of a person to change positions in space or to change directions quickly and effectively e.g. football player quickly changes direction or giving dodge to opponent, hurdle crossing over the barrier or hurdles, zig-zag running, etc.

7. Balance : Balance is the ability of a person to control human body or to maintain equilibrium under static and dynamic conditions e.g. hand stand, skating, skiing, catching a fly in baseball, etc.

- By Body Health Blog .

Chop stroke.————

The racquet face passes slightly outside the ball and down the side, chopping it, as a man chops wood. The spin and curve is from right to left. It is made with a stiff wrist.

The slice shot merely reduced the angle mentioned from 45 degrees down to a very small one. The racquet face passes either inside or outside the ball, according to direction desired, while the stroke is mainly a wrist twist or slap. This slap imparts a decided skidding break to the ball, while a chop “drags” the ball off the ground without break.

The rules of footwork for both these shots should be the same as the drive, but because both are made with a short swing and more wrist play, without the need of weight, the rules of footwork may be more safely discarded and body position not so carefully considered. 
Both these shots are essentially defensive, and are labour-saving devices when your opponent is on the baseline. A chop or slice is very hard to drive, and will break up any driving game.

It is not a shot to use against a volley, as it is too slow to pass and too high to cause any worry. It should be used to drop short, soft shots at the feet of the net man as he comes in. Do not strive to pass a net man with a chop or slice, except through a big opening. 
The drop-shot is a very soft, sharply-angled chop stroke, played wholly with the wrist. It should drop within 3 to 5 feet of the net to be of any use. The racquet face passes around the outside of the ball and under it with a distinct “wrist turn.” Do not swing the racquet from the shoulder in making a drop shot. The drop shot has no relation to a stop-volley. The drop shot is all wrist. The stop-volley has no wrist at all. 
Use all your wrist shots, chop, slice, and drop, merely as an auxilliary to your orthodox game. They are intended to upset your opponent’s game through the varied spin on the ball.

The half volley.—————-

This shot requires more perfect timing, eyesight, and racquet work than any other, since its margin of safety is smallest and its manifold chances of mishaps numberless. 
It is a pick-up. The ball meets the ground and racquet face at nearly the same moment, the ball bouncing off the ground, on the strings. This shot is a stiff-wrist, short swing, like a volley with no follow through. The racquet face travels along the ground with a slight tilt over the ball and towards the net, thus holding the ball low; the shot, like all others in tennis, should travel across the racquet face, along the short strings. The racquet face should always be slightly outside the ball.

The half volley is essentially a defensive stroke, since it should only be made as a last resort, when caught out of position by your opponent’s shot. It is a desperate attempt to extricate yourself from a dangerous position without retreating. never deliberately half volley.

Court position.—————

A tennis court is 39 feet long from baseline to net. There are only two places in a tennis court that a tennis player should be to await the ball.

1. About 3 feet behind the baseline near the middle of the court, or

2. About 6 to 8 feet back from the net and almost opposite the ball.

The first is the place for all baseline players. The second is the net position.