Running is one of the most convenient of all sports. All you need is a pair of running shoes, and out the door, you go, but you’ll still need good shoes.  Here’s the (costly) truth. If you log in serious miles every week, you’ll burn through more than a few pairs of shoes a year. At a minimum, you may need to replace those $100+ shoes at least every four to six months.   In other words, pounding the pavement may drain your bank account faster than a four-minute mile.