I would like to know a good website that is free and has online videos regarding coaching tennis

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If you are undergoing coaching, then you already are following a tennis specific program. But the intensity of your training depends on the level of tennis you play. To further improve your fitness, you could try to go to some tennis coaching centre or clinic of repute that provides a tennis specific training regimen. They would have a program that would help improve your technique, breathing, endurance, etc. Depending on their quality, they might have trainers who could work with you individually to help identify your strengths and weaknesses. As far as improving your court coverage is concerned, a good training centre apart from the normal training might provide separate athlete agility training programs that can be custom suited to your needs. There could be several such centers in Mississauga and Toronto.

You can search for a coach in this list: http://www.usatt.org/coaching/coaches_list.shtml they are all members in the USATT (usa table tennis association) and you can find them by state.