Body Combat and weight gain

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Has anyone else been doing the Beachbody 60 day body combat challenge and noticed weight gain? I'm taking measurements tonight to try to hopefully see some difference in inches but to go from exercising 3x / week to 4-5 and gain a few lbs? Really??!! I'm busting my butt here (hopefully) and I'm not seeing the scale move. I know it's only a number but I'm using a HRM to calculate the calories burned now and this program is a huge calorie burner. Very frustrating!