I want to know whether I can make models in external software like 3DS Max and then import and use them in flash.
I want to make a game where there is a 3D animation of a an athlete running on athletic field.
How can I go about making that animation and using that in my flash game.
I think it must be possible as there are games like http://www.agame.com/game/street-sesh.html
which use 3d graphics.
Thanks in advance.
Unfortunately it is not possible to bring models into flash and use them in the capacity you are talking about. You CAN, however render out a series of images from 3DS Max and bring them into flash.
Other options are with applications like Papervision 3d which simulate a 3D environment.
EDIT: The game you linked is run in Shockwave player not Flash which means it was most likely made in something like Adobe Director.