A mile is 1609m if I'm not mistaken, so if anyone is running 2 miles in 7 minutes, I'd go look up your local athletics association and start breaking some world records...

Even running at a mile per 7 minutes pace is pretty quick (3.2km in 14 minutes) and not something your average person could do without some training. If you are new to running I certainly wouldn't try to run every single day as that is a surefire way to start picking up niggling injuries (or if you're unlucky some serious ligament/tendon damage). Start off by jogging for about 20 mins 2-3 times a week and build up the amount of time so after 2-3 weeks you are running for about 40 minutes at a time.

If you do start running Rhyfelwyr, get some running shoes fitted at a proper running shop not just your generic sports store, or you'll probably suffer from blisters, etc and store up longer term injury problems for later in life. Alternatively swimming a few times a week is a great, low-impact form of exercise if you want to just get generally healthier and I'd be surprised if your uni didn't have a pool. As others have said, eating a balanced diet is always good too (I know how hard that can be when you're a student though ).