Yamabe has written some good threads on this, but the jist is...
We are all different and our bodies are unique so what works for one person may be a total disaster for someone else, but on a whole...
in regards to exercise..What actually happens is that because of your low calorie intake, when you exercise (particularly cardio stuff that gets you out of breath and sweaty) your body uses itself to provide the energy for it.
Although it burns fat, it also burns muscle. To replace this muscle you need lots of protein, and you're not getting it whilst on total solutions.
So if you exercise too much you lose muscle. Now the more muscle you have, the faster your metabolism runs as a general rule. So less muscle = slower metabolism, and of course slower metabolism = slower weightloss!
This is why to much exercise isn't recommended, especially cardio and especially when you are on exante total
Exante recommend abut 20 mins light exercise only.but Do the stretch and tone and strength stuff first, this will help you maintain your muscle rather than burn it. then maybe throw in.. ie Go for a walk. Go swimming maybe.
Yama has the wise ideas but this thread helps too:
(Benefits of Resistance training on a VLCD)
http://www.minimins.com/cambridge-diet-forum/132363-benefits-resistance-training-vlcd.html