Half marathon and hiking trainingWatch
I'm doing a half-marathon in March and the 3 peaks challenge in June and just want to know the best way to train for them, given I'm in reasonably good shape but don't do regular running
If you have done little or no running you will probably need to start with something like the Couch to 5K routine (free online) and then a beginner half marathon plan after that. The book Run Less, Run Faster is great and will set you back abut £5-10 on Amazon (or just borrow it from your library for free).
As far as the 3 Peaks goes it isn't that difficult, the main issue is the amount of ascent and descent (around 3,000m of each) that puts a lot of pressure on the joints of your lower body. If you haven't done any preparation you will really hurt.
If you're looking for a pre-made plan I would recommend Strong Swift Durable's (formerly Mountain Athlete) 'Bodyweight Routine' closely followed by their 'Peak Bagger' routine. If you're already very experienced this article gives you a rough overview of the key principles, exercises and programming they use which you can then extrapolate your own routine from. The main aim is to maintain the endurance you've developed for the half marathon by doing one long run a week while developing the necessary sport specific endurance with the weighted stepups, leg blaster complexes, etc.