Few more questions...

I get out of school this monday the 20th and at some point I plan on training pretty hard all through out the summer. I want to run on a tredmill for about 30 minutes or 45 minutes twice a day, once in the morning and at night. Should I do this every other day? Or should I just run once a day?

I'll also be working out a certain set of muscles twice a day once in morning and once at night. Is this ok to do? Or should I just do it once?

Just incase you missed the previous post, I'm 15, 5'8'', 160lbs.

Also, I use the Bowflex Sport. I use the 30 resistance rod. I'm not sure what this translates into for free weights, but I do a certain exercise 25 times, 4 times for a total of 100.