So many runners hit a plateau fairly early on in training — we get stuck around the four- or five-mile mark for our longer runs and just never seem to more »
Think about how fun it would be to hit the trails for two hours — just you, your heartbeat and nature — on the weekend. Or maybe you dream of running a marathon. If you have a goal in mind, a training plan is highly advisable when it comes to adding mileage to your week, but if you’re just looking to add a few more miles to your weekly total for fun or to see how long you can go, there are a few simple tricks to going long when you’ve never gone long before. Here we present six of them. The keyword to keep in mind? Slowly.
Source: 6 Tips on How to Run Long (When You’ve Never Run Long)
My Comments: Really good piece of advice.