The Biggest Loser Fitness Book also has a lot of great circuit routines that will leave you feeling like you have accomplished a lot, and you will be a little sore the next day, but not to the point of paralysis. If you bring out the big guns and go balls to the wall with exercise all at once, you will not be happy, you will probably quit before you get very far, and you will have wasted your time. I am a huge believer in starting small, 30 minutes a day is a good amount of time, but build some endurance first. Then you can add more difficult activities as you get stronger. It seems like you are doing too much, too soon.