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How much harder is a trail marathon?

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Mar 2017
9:41am, 6 Mar 2017
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MonsieurDeBeurre
I'm looking to run an A to Z of marathons and had registered for the Marathon Des Isles on 30 April, trouble is it's been cancelled! My alternative is Innsbruck on 29 April but it's a trail marathon and that's a thought I'm finding pretty scary.

Anyone transitioned from a 'normal' marathon to a full on alpine trail marathon? Toughest I've done to date was the Gower in the Coastal Trail Series. Anyone got any thoughts on just how much tougher Innsbruck would be? Should I just forget it and wait till the Isle of Wight....?
Mar 2017
9:57am, 6 Mar 2017
18,215 posts
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fetcheveryone
Welcome to the forum :-) I'm not sure what the answer to your question is, but I wish you good luck :-)
Mar 2017
10:05am, 6 Mar 2017
2,081 posts
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K5 Gus
Welcome to Fetch :-)

For your A-Z quest, would it bother you if it wasn't actually a marathon in distance ?

Although they call it the K42 trailmarathon, it says on the website that it's 40 kilometres. 1450m of elevation is a lot !

The K65 ultra also looks short, at 60km, why not just call it the K60 ??
Mar 2017
10:14am, 6 Mar 2017
35,709 posts
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Velociraptor
How much does running on trail slow YOU down in comparison with running on road?

For me, the difference is huge - the CTS marathons I did took me almost twice as long as a road marathon would have taken me at the same level of fitness - but some people can convert between surfaces with little problem.
Mar 2017
10:21am, 6 Mar 2017
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MonsieurDeBeurre
It's the hills more than the surface that's bothering me. Happy enough on trails, and used to doing a bit of training on hills, but the Staffordshire Moorlands are hardly the Alps!

I can probably get my head around the 2k less - it's called a Marathon after all!
Mar 2017
1:20pm, 6 Mar 2017
1,875 posts
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Surrey Phil
Trail marathons on grass are tough particularly if they get muddy. There are other trail marathons which take place on gravel or woodland paths which naturally are a bit quicker.

Wishing you well on your venture!
Mar 2017
2:43pm, 6 Mar 2017
501 posts
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SailorSteve
Nice quest MD, and welcome!

For what it's worth, my 10 mile road time is generally around 1:10; 7 min miles. Having done about 400 miles of training in the Alps this winter it seems my 10 mile time on trails here is regularly around 1:30; 9 min miles.
Mar 2017
9:43pm, 6 Mar 2017
6,652 posts
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CStar
I reckon my road marathon time is about 3:40 on a good day (hopefully 23rd April!), but did Beachy Head in October in 4:35 (without nearly enough training). Plenty of hills in that one, though unfortunately mostly at the end ;-)
Mar 2017
10:01pm, 6 Mar 2017
22,640 posts
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Derby Tup
In 2007 I ran the Yorkshireman (full, trail, off-road) a few seconds faster than the London. Trail is easier ;-)
Mar 2017
10:25pm, 6 Mar 2017
685 posts
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loki
Welcome to Fetch MDB. If you're more concerned about the hills, there is a convention that 1000ft (~300m) of ascent is equivalent to a mile on the flat, so if you know how much ascent there is then you can in theory work out roughly how much longer it should feel like than the same distance without the hills.

Should say that I've never thoroughly checked this theory out but it does seem to feel about right for me. YMMV.

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Maintained by MonsieurDeBeurre
I'm looking to run an A to Z of marathons and had registered for the Marathon Des Isles on 30 April...

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