I started to run 1.5 miles in the mourning and wanted to get a bike ride in there too. If I run the 1.5 miles and then the next mourning rode 7.5 miles could this be to much for a beginner to training? I was planning on rotating one day run and the next day ride. This is mostly to build endurance. Most people I talk to that run, run more than 1.5 miles, I would like to start off slow with the running though. Also today was the first time running outside, I used to run on a treadmill down in my basement. Much better time outside. Thanks for any information.