I signed up for a half marathon (there were half + full marathon races for the same event), taking place in April '16, and started training last week (Around 13 December). I'm not a regular runner (or exerciser in general), but I think I'm naturally physically inclined towards cardio activities. [Early 20s, male, 60-70kg, 170-180cm.]
As part of some 'beginner to half marathon' schedule I'm following, I went for few 3milers throughout the week, and then yesterday went for a 5 miler.
But I ended up running a full 13.2mi because I was feeling pretty comfortable. Running a fairly easy, steady pace, I finished in 1hr 55mins. I was tired but happy, and not completely exhausted.
Bearing in mind I was training to simply finish a half marathon, I'm now slightly concerned that I set my goalposts too far apart. I want a target that is hard to achieve but feasible with enough training, and a bit of mental fairy dust.
So: Could I feasibly switch to running a full marathon in a respectable time (which would be more of an impressive achievement in my eyes), with 15 weeks of training? If so, would I be looking to simply finish, or could I probably try a good time?