I graduated 10 days ago and set out with the plan of getting into a routine of two runs in the week, one gentle, one with intervals, and a longer run at the weekend.
So I ran the gentle run on a Friday and then added 10% - taking me up to 33 mins - last Sunday morning. By Monday evening I had all sorts of new aches and pains from my right shoulder to my right ankle, including a sore patch deep in my right cheek (the one I sit on 
I did a whole set of stretches but was no better on Tuesday so I swapped my mid-week runs for a long walk and a swim. It was okay when I was moving but worse again when I was sitting. I did some googling so that at least I could name the 'cheek' muscle that hurt - the one I sit on.....is called the piriformis.
Eureka - apparently sometimes this tightens up and pinches the sciatic nerve. It was that that was complaining all the way along its path. It was so easy to sort - 30 mins after doing a set of stretches specifically for the piriformis I had no discomfort. I decided to leave it for 48 hours (and meanwhile keep up the stretching) and then run, I'm just back from a great run in the April sunshine.
In future if I get any aches, numbness or pins and needles in my leg I am going to suspect the piriformis. I need to keep stretching and work on my core strength.
One of the solutions to this problem is to sit cross-legged on the floor rather than in a chair, so I have been doing that. Funnily enough my dad, and when she was alive, his mother were known for sitting on the floor and both sometimes had sciatica so I think they'd arrived at this point themselves.
I'm so relieved I'm running again - I really missed it! And swimming is fine as a change sometimes but it is so boring compared to running through the local scenery.
Hopefully you won't get it again and if you do you know what to do now 
Week 3 in the bag..... but.....
Week 4 run 2 in the bag. Over the hump!
PG (post graduate) R3
C25k Graduate. Who, me? YES, Me!!
