Hi Lisa, My experience: in the first 2 months of working out, this happens about 80-90% of the time after a really hard workout. Thereafter, only about 30% of the time - I think in my case my body just decided to hold onto the excess water in a semi-permanent way so the fluctuations aren't as noticeable. And then if I stop working out for a week, I drop 3-4 lbs without doing anything differently, but it doesn't really show up visibly or in my clothes.
For it to be visible in the mirror, I would think your body fat would have to be pretty low like under 18%.
It's actually a pretty common response from starting/increasing a workout program for your muscles to retain water.
Almost certainly this is what you are seeing.
Fitness Minutes: (1,363)
2/21/13 3:46 A
A few days after really hard workouts, especially with weights, I will see a 1-3 lb increase in the scale, and I know it's not 1-3 lbs of muscle, and I also know I haven't eaten more to cause a 1-3 lb weight gain of fat, so I was wonmdering if anyone else's body does this to them too?
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