Practice for the Boston Marathon. For climbing you mount a virtual wall and encounter breezes, wind, fog and temperature changes just as you would on real mountain. The club fitness machines are all computerized, networked, and recognize the user. They have big screens and the content is varied and includes actual courses for that machine in full multimedia. The machine automatically checks for your last workout suggestion and you get to choose whether to go with that.
Treadmills change their grade according to the graphical course prompting.
The screen tells you who else is on the course so you can join them virtually or even race. Clubs can use this network opportunity to hold competitions. Special Training Centers will be available for Olympic and professional athletes. Virtual environments with computer simulations of other athletes and their performances will allow athletes to compete virtually against themselves or their rivals, with complete data recovery. Most Olympic events that require physical environments, such as pools, that make virtual competition unlikely, but there are other sports, such as cycling, that could have virtual events quite easily - an extension of what is done now, but with streaming video of the riders, voice over, etc.