Hips and glutes mainly
Some advice from my yoga teacher, Kat (
www.yogi-bare.co.uk):
These are very much worth a watch. The first video is great and echos the vital running stretches for the hips given in Timothy Ferris' book the 4 hour body
https://www.youtube.com/watch?v=Njmt5z6WNUo&featur...
https://www.youtube.com/watch?v=MIs13f68VT4&featur...
Here is your routine! Try to do 1-2, 1 x week plus our session. They vary in length and shouldn't eat up too much of your time as I know how precious time is for you and your training.
https://www.youtube.com/watch?v=4cO-cwddcd8
https://www.youtube.com/watch?v=c9JGvW9j9JE
https://www.youtube.com/watch?v=6kMIhQKrGrc
If you are pushed on time here are a few stretches you can mix and match:
http://www.runnersworld.com/the-body-shop/yoga-for...
Another strange but useful tip for runner care: Epsom salt baths with coconut oil and rubbing castor/sesame (untoasted!) or coconut oil into your joints and allow to soak in.
Some interesting final notes on when to stretch below:
General maintenance: try to incorporate at least one proper stretching session into your training per week. This means a minimum of twenty minutes working on your suppleness.
Night before the race: a loose, rangy stride is something we all strive for. When you watch the pros eating up the hills, they look like they are floating, whereas for many of us, it feels more like a grind or a stomp. Loose legs will help. So, the night before, do a twenty minute stretch to ease off the muscles and also relax the mind.
Immediately before the race: it is probably cold and dark and you are more concerned with getting the right food in, what’s happening with your bowels and changing the battery on your headtorch, but do take a little bit of time to warm up. A few minutes of drills: knee lifts, bum kicks, side strides, back trots and some easy back and shoulder stretches will pay dividends.
During: Dean Karnazes, ultrarunner extraordinary says, “"No matter how hard I push, my muscles never seize up. That's kind of a nice thing if I plan to run a long way." Lucky old him. Most of us will not have that luxury. A quick stretch at a feed station or when your lungs have given out at altitude and you need a break, can help with pain. A whizz through the static stretches for calves, hip flexors, quads and glutes. But do not overstretch a sore bit.
After: If you are too sore straight after your race to stretch, don’t. But try to do it a little later or definitely the next day. If you can, treat yourself to a massage or a steam/sauna, making sure you use the cold intervals too. Then, you can congratulate yourself on working on your suppleness and enjoying it.