Michelle-Here's my experience, take it for what it's worth. You have to be the one that decides what is best for you (like big dog said)...
Before I started MRC I was a big exerciser. 30-60 minutes of hard cardio and or strength training 5-6 days a week...sometimes more. People would say that I should be a stick...but the problem was I was overcompensating with eating too much, so stuck...then I started MRC and I knew it was time to just focus on eating.
The calories on the plan (green) were too little for me to keep up my same exercising. I didn't have the energy. So I did a few weeks of no exercise, then I got to where I could do low energy activities about 3 days a week...pilates, yoga, walking, or light strength. Much more would zap me...or I couldn't even lift up my legs. But I knew it was time for me to focus on eating...and it happened that I was busy and also nursing an injury so it was a good time to cut back.
Got to the point where I had lost about 20 lbs and did some calculations based on my body fat...and I'd lost about 7 lbs of muscle (which lowers metabolic rate). So I decided it was time to add in more activity. When I did I was STARVING. So I told my center I was ready to exercise more and was too hungry. My consultant listened and suggested a different eating plan that is SUPPOSED to slow down loss, but it actually sped up a bit with me because of the increased activity (I'm running 2x per week, intense cardio strength circuit DVD's 2x per week, 1 day of pilates/yoga/core, and then the other 2 days I can rest if my body is hurting-it is today-or do light activity like walking or dancing). I decided AT THIS POINT even if it slowed my loss, it was time to add back in activity and build my muscle back up. But I also know it was totally important for me to step away from the exercise for a time and see that it's what I put in my mouth that is most important. For me, the exercise isn't for weight loss or even looking good (although that helps), it is for my mental health
And lesson re-learned this week. Because I had amped up the running and lost more I was a little overconfident and started snitching bites off my kids' plates (justfiying that I was more active...which is why I could never lose in the first place). So the scale creaped up...yes, I'm sure I'm also building muscle/retaining fluid for muscle repair. But I now learned not to snitch (when time comes for maintenance, I can have scheduled treats) and to cycle my exercise program so that I don't have a heavy workout right before a weigh in (especially strength). See my weekly schedule below...it's all a work in progress:
Monday (official weigh-in): Strength/cardio circuit (after weigh in)
Tuesday: Pilates/Yoga/core
Wednesday: Run/walk
Thursday: Strength cardio
Friday: rest or light activity
Saturday: Run/walk
Sunday: rest
(strength days affect my weight the most for about 24-48 hours due to fluid accumulation from repair).