IMHO, doing cardio for an hour and a half is going to be way too much for someone new to working out. Even if they are coming back after a lay off. Doing that much cardio, in a relatively deconditioned state, is going to burn muscle (in addition to the fat). The decreased muscle is going to lower their metabolism. Especially if they are not really lifting weights. Plus, if you start at 90 minutes, where do you go when you plateau? 2 hours? 3?
I think with someone new to working out (or coming back to it), doing 3-4 a week at 30-45 minutes is *plenty*. If you are deconditioned, this will be enough to start the fat loss. Then, as the body adjusts to the exercising, either add more time, more days, or increase the intensity. Or add interval training.
For FAT LOSS, diet is going to be the #1 thing - clean up your diet and results should start quickly. The base for every workout program should be a clean diet - not an excessive amount of cardio OR weight training.
I think with someone new to working out (or coming back to it), doing 3-4 a week at 30-45 minutes is *plenty*. If you are deconditioned, this will be enough to start the fat loss. Then, as the body adjusts to the exercising, either add more time, more days, or increase the intensity. Or add interval training.
For FAT LOSS, diet is going to be the #1 thing - clean up your diet and results should start quickly. The base for every workout program should be a clean diet - not an excessive amount of cardio OR weight training.