Running

I did a lot of reading up on training for my first ultra, everything said slow down (more than you think you need to) and just focus on time on feet. It's good advice but I'd keep up the interval/hill work too to maintain the speed/strength you have.

Marathon you tend to have more of a time goal so you'd do long runs with target pace sections, or target pace workouts. Don't generally see those in ultra plans.

Can anyone remember making the jump from half marathon/marathon to ultra and what changed? Did you do more long slow miles or just stay the same and trust it would all come together?

Many more slow miles, gradually extending weekly long run.

Also back to back / double day runs, more run commuting carrying stuff.

I didn't do much faster training stuff but did race 5k's in and around training and found running slow hadn't made me slower, but I possibly could have gone even faster / got injured if I'd done more speedwork - i'll never know for sure which.

It depends a bit on whether you're looking to just do one / finish one, or to get a time.

If you're looking to just complete, then you can probably just go and do one.

Did this switch about a year and a half ago and came in here for advice too! Just basically took things way slower, sometimes walking breaks, eating real food and carrying water topping up when needed. I was surprised how possible it was to take the fitness from marathon into running twice as far (plus). Done just by slowing the pace to a steadier jog, varying the terrain so I didn't get bored and steadily extending my weekend long runs to around 30 milers (4 to 5 hours time on feet). I'm back to marathon currently.