Thanks for the advice everyone.
I basically concluded that:
Do I want a leisurely ride, or do I want to pump it up a few notches to stay fit and increase my riding?
Riding more consistently, such as three times a week of 10 miles or so. Perhaps it's time to invest in a bicycle trainer?
Replenishing myself with electrolytes instead of just plain 'ol water. My mom said that if I kept drinking that stuff daily I'd become a diabetic, but I definitely exercise wayyy more than she does.
