Weigh In Wednesday

I weighed myself before I started exercising today and I was:

160.8 pounds
34% fat
48.1% water
56.2 lbs muscle
24.3 BMI

I also weighed myself after I finished exercising and I was:

162.2 pounds
35.1% fat
47.3% water
55.6 lbs muscle
24.5 BMI

You'd think that after a workout you'd weigh less. The being lower on water makes sense to me though.