Movies can’t go on if the principal actors are injured.

Stunt doubles are usually highly trained in safety and technical techniques.

The easiest way for your problem to be solved is to hire people who are already professionals. Or, go to the US which has a highly developed industry, and LEARN HOW. It isn’t the kind of thing that a single yahoo answer will solve. There are LOTS of ways to handle this–go to an accredited film school. Take workshops. Learn skills that support stunts, such as tumbling, judo, karate, dance, choreography, physical fitness, aerobics, etc…

http://www.ehow.com/how_138384_become-stunt-person.html

http://entertainment.howstuffworks.com/stuntmen6.htm

http://www.ultimatestunts.nl/

http://www.metacafe.com/tags/stunts/

http://www.pcgaming.ws/viewgame.php?game=stunts

http://www.stuntsunlimited.com/

Regardless, feel free to knock yourself silly at the links, below!