I need a summer bicycle workout routine
I am living at home for the summer before I start a new job in the fall. I usually have a gym membership but I do not feel like signing up for one for so short a time. I live in Statesboro, Georgia and would consider riding with the bike shop guys in the mornings, but I do not think I could keep up with my mountain bike. My bike is very nice, I have had it regularly tuned for the five years I have owned it - it is a Schwinn. I bought a mountain bike because some of the places I ride have sandy dirt roads. I originally bought my bike to commute to work about 8 or 10 miles away, depending on which job it was. Now I have no reason to ride my bike except for pleasure and exercise.
Should I just go exploring around the roads of my college town/farming community area?
How fast should I be going? mph?
What are some workout goals I could set for myself?
Should I look for dirt roads specifically, to use my mountain bike appropriately?
I do not know alot about bike riding technically, all I know is I pretty much ride the same way I did when I first learned - just for fun. Now I would like to know where I am in the bike fitness scheme of things, and use it for my workout. Could someone tell me what I could do to challenge myself?