I decided to buy a bike and start riding to school (about 5 miles to my university) because I'm a fat fuck (5'10'' 230 pounds/104 kg). Any tips on what kind of bike to buy and how to maximize my time on it? The fuckers on /fit/ talked me up to a $400 budget, so I wanted to buy a mountain bike and ride on high resistance or get a good single speed and pedal fast as fuck. Advice appreciated