For the last week I decided to walk home from work everyday (About 4 miles a day). With that and other exercise I walked 27 miles last week, and it really showed in weight loss. I lost 5 pounds last week! I was thrilled seeing such great results.
Over this past weekend I decided not to do any walking to let my muscles rest. (My arms and legs had been getting pretty sore.) I woke up this morning, and decided to weigh myself because I have a weigh in today. I'm the exact same weight I was before I started walking
Does walking lead to such great weight fluctuations? I've stayed well hydrated throughout so I wouldn't think I just lost water weight. I also didn't eat any more than usual over the weekend

I know muscle can weight more... but for it result in a net loss of zero pounds seems unrealistic.
I'm just so confused... and actually quite angry since after all that hard work I don't have a single thing to show for it. I'm tempted not to bother exercising at all if this is whats going to happen when I take a short break.
Does any one have any suggestions or ideas about how this could have happened?