Quick Running Question

Ok I am going to make this short as possible

I want to run to stay in shape and tone up...I am only like 148 lbs and 5'10 so I do not want to lose weight

What kind of running should I do to accomplish this? I would really prefer to not have to run for more than 25 minutes if that is possible, I really just want to stay in pretty good shape and tone up

thanks for any help i appreciate it
 
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