That is great on the free weights Julia? It is a little addicting isn't it?

You do 90 minutes of cardio? Yikes that is ALOT...

You are correct about cardio and muscle mass. I feel the bodies ability to recuperate is finite. Too much cardio produces way to much muscle destroying cortisol.

I too don't recommend cardio on the days when one lifts. One is going to suffer. Who wants to do cardio after a brutal weightlifting routine? And again our recuperative abilities are finite.

But for some, they have to, due to time restraints or they have super recuperative abilities.

Hey, intervals don't have to be all out..especially at this point. You will advance as you keep going.

You are doing awesome! Keep lifting those weights,they'll give you the most improvement in body composition. The more muscle you have the better you will look and your metabolism will be increased.