oprah's boot camp was a three month program that consisted of a diet and exercise regimine. The diet basically was
1) no refined carbs...aka "white stuff"
2) no grain based carbs for the first month...no breads, cereals ect
3) unlimited green stuff, moderate comsumption of lean proteins, furit and dairy
4) no alcohol
5) no eating after 7 pm
The exercise portion consisted of 8 sessions a week which included cardio and strength training. Oprah's website outlines the program as well as teh strength training and a circuit workout that is recommended.
I hope this helps

Check out Oprah.com for more details.