I don't know how Olympians swim that many laps

When I went swimming on Thursday (which, by the way, was only my second day of exercise for the week), I felt pretty good doing laps. I did about 25 total, broken into 15 and then two smaller sets. A number of my laps came at a good speed. In fact, for about three or four laps I felt challenged by a boy swimming next to me who appeared to be about 10. I was not about to let that kid swim faster than I could, so I swam pretty quickly.

When I went swimming again today, the laps did not come as easily. I felt slow and sluggish almost the entire time. I started off with 15 again, then did a few smaller sets, eventually ending up with 30. I also jogged in the water a few times, probably for about 20 minutes total. And I did some lunges, squats, push-ups, and dips while in the water. I definitely had a good workout, but I was just not "feeling it." I pushed myself to swim fast a few times, but it was a struggle. I could barely do two fast laps in a row.

I am blaming this on the four to five pounds I have gained the past three weeks, which is related to my poor eating, which probably hinders me even more. Hopefully I can get on the right track soon...