4 Days of insanity and gained 8 pounds

You haven't gained any muscle after four days of Insanity eating 1500 calories. You're retaining water as a result of your new workout routine. It'll go away.

I've been doing zumba for months now and can't seem to lose any weight. My body is looking more muscular though especially my legs... my pants are fitting tight. I decided to replace zumba with brisk walking. I lose more when I walk but it's boring and I burn 1/2 the calories I burn doing zumba.

Hi! I am by no means an expert, but I had a similar reaction recently when I started the 30 Day Shred. From what I understand when we start building muscle and our muscles are repairing we retain water. Also, muscle is heavier than fat. I could be wrong, but I think this could be what you are experiencing.

^^THIS.

Probably not so much "muscle gained" in 4 days of Insanity, but definitely retaining water. Your body will adjust, but you need to keep your H20 intake HIGH. This will keep your body in "flushing" mode and you will actually get rid of more water the more you drink.

Be sure to eat healthy; diet is CRUCIAL in Insanity, and if you aren't eating enough you WILL "bonk".

... muscle does not weigh more than fat. A lb of fat weighs the same as a lb of muscle. Muscle just takes up less room.

Therefore if you have the same amount of muscle as you had fat, you will weigh more because muscle weighs more than fat by volume.

Seriously...people know what this means. No one thinks that a pound of muscle weighs more than a pound of fat. The people who keep making a point of saying this don't look smarter than the rest of us...they just look like they don't get it. Come on.
OP - yes, you are retaining water. Imagine how much you'd have to eat to honestly gain that much weight in 4 days. It'll go away!

... muscle does not weigh more than fat. A lb of fat weighs the same as a lb of muscle. Muscle just takes up less room.

Therefore if you have the same amount of muscle as you had fat, you will weigh more because muscle weighs more than fat by volume.

Seriously...people know what this means. No one thinks that a pound of muscle weighs more than a pound of fat. The people who keep making a point of saying this don't look smarter than the rest of us...they just look like they don't get it. Come on.
OP - yes, you are retaining water. Imagine how much you'd have to eat to honestly gain that much weight in 4 days. It'll go away!

It seemed pretty clear that the poster knew exactly what they were talking about, which is why the words "by volume" was added on. You're the one who interpreted and paraphrased incorrectly.

I started insanity & got to 150 pounds from 145 but I lost it after about 2 weeks....:drinker:

Congrats on starting Insanity! As per the weight scale, don't worry too much about it! Best thing to do is continue on with Insanity, and measure your chest/waist/hips/etc. You WILL see differences! Your weight will fluctuate up and down, and a lot of it could be due to water retention and muscle weight.

I'm a 26 yr old female, 5'3, and I currently weigh 170.8 lbs, and I also have PCOS. The first time I did an entire round of Insanity, I lost about 30lbs, watching my diet moderately (aka avoiding junk food). I am currently on my second round of Insanity (just completed Month 1 yesterday) and I have so far lost 13 lbs! But what I am doing differently this time is strictly watching my diet. I am watching my carbs, keeping it less than 100 g per day, and I try to keep my calories around 1000 everyday. I eat eggs in the morning, a 80% veggie/20% fruit shake for lunch, a 30 g carb lean cuisine for dinner and a small bowl of warm oatmeal/milk at night. I avoid eating bread and rice at all costs. I also have a cup of green tea in the morning, and a cup of water with 2 teaspoons of apple cider vinegar before dinner.

By the end of the day, I check the pedometer app on my smartphone to make sure I have walked at least 10,000 steps for the day. And before I go to bed, I do an hour of strenuous Insanity workout.

Overall, I feel a lot healthier, energetic and happier. I know Insanity is very tough, and you may feel that you need those extra calories/carbs to be energetic, but if you make sure you are eating a moderate amount of veggies every day, that should compensate a lot for your low carb and calorie intake. I cannot stress enough how a low-carb diet alongside daily Insanity workouts work wonderfully for maximum weight loss! But should you choose to take on a low-carb diet, please incorporate most of your proteins from veggies and not just from meats! Good luck :-)