I will be running the London Marathon in April this year. It is my first time running in any race and I have one 10k booked in February too. I would say I am of average fitness but I am only starting my actual marathon training today. I am doing this purely to raise money for charity so it is something I would like to do, especially as I have already had some sponsorship come in. I am hoping for a time of around 5-5 1/2 hours, although I would be glad to just finish!
Am I being unrealistic and setting myself up for failure or injury? If not, what are some tips you could give me. I have downloaded a training plan which seems achievable to me but any extra advice (or warnings!!) would be really appreciated!