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What a personal trainer or coach can do for you:
Although it's now a well-known occupation, most people aren't sure what a personal trainer can achieve until they begin to reap the rewards.
Usually, a personal trainer is hired for a specific purpose:
It could be for weight training, nutritional advice, core muscle training, aerobic or anaerobic fitness, running, swimming, football, tennis or another specific skill, sport or event. There are specialist personal trainers for each of these.
The results are usually the same:
An improvement in technique, followed by a sudden and unprecedented increase in strength, skill, speed, stamina and power. 
At one time, footballers, tennis players and other athletes were the only people using personal trainers to help them excel at competition level.
Today many more people – celebrities, actors and the rich and famous – are using personal trainers to help them learn how to play sports like tennis, golf, exercise, lose weight, build muscle and adopt a healthier lifestyle.
A sport-specific training program involves focusing on the specific skills associated with an activity (e.g., tennis players strengthening the rotator cuff muscles to improve their serve), while improving cardio respiratory endurance, muscle strength, core stability and flexibility, this means one-on-one training is more in demand.
The goal of stength and conditioning coach or personal trainer is to help athletes prevent injury and excel in a sport. Each athlete has a different set of training needs based on the sport and individual differences. Strength and conditioning, in general involves applying different forces to movement, the body learns to cope and react to these forces.
Practice sessions must be approached with a sense of purpose. That means asking yourself some very basic questions. How much of an investment, in terms of both time and money, can you afford to make in your tennis? If you want to get the most out of your court time, knowing how many hours you can allot to the game will allow you to plan appropriately. When you do play, try to remember that tennis is like every other sport, in that if you wish to improve your game you must work at it, give it concentration and remember that essentially it is a sport and good excercise. And for practice to work there must be lots of it. For example, anyone who has ever taken up a sport like tennis knows that it takes some time before it is possible, even with coaching, to sustain a collaborative five-stroke rally.
Go to a tennis court and practice the various movements needed to be competitive. This will give the player "court sense"
Running is excellent for the legs and lungs with distance for stamina and sharp bursts of short sprints to keep a player conditioned for the many short bursts of speed neccessary getting to the net, moving across it, back to the backcourt for lobs and for the many points a good player must scramble for in top company.
Weight training can help improve your serve and overheads.
Exercising and stretching in general can help reduce injures. Physical conditioning is a necessity - sprints, sliding, crossovers,jumping rope, etc. Work on developing fast feet.
You are not stuck where you are unless you decide to be. -Wayne Dyer
"To become a champion you must first look and act like a champion!"—Muhammad Ali
