One pound of muscle and one pound of fat are NOT the same size.
If I place one pound of muscle on a scale and one pound of fat on a scale, they will both weigh one pound. The difference is in total volume. One pound of muscle may appear to be the size of baseball.
One pound of fat will be three times the size and look like a squiggly bowl of Jell-O.
See for yourself
Before exercising I weighed 141 pounds and was a size 10.
After my first round of Power 90, I was 139 pounds and a size 6.
Assess your results by using a tape measure to calculate inches lost, note how your clothes fit (or don’t fit anymore) and lastly step on the scale.