Running

Do you guys have a regular stretching/strength/core programme you go through to minimise the chances of injury? Stretching etc is something I could definitely be better at. Also how do you incorporate cross training (cycling) into your training - I'd be loath to give it up but combining 60-70miles a week with cycling is probably a bit much.

Fuck no to stretching - who'd be arsed with that? I alternate my commute with biking and running, and aim for long ride Sat / long run Sun.

I'd equate a hilly 100-miler to a flat double-ironman - TT isn't hilly. Ultra running generally isn't too bad for impact injuries, as you're doing a lot, but not much is fast, hard impact.