Dead legs.

[Noodley]

How sore are they? :

 

[Keith Oates]

Depends!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

[Dayvo]

Only had one twice; within five minutes of each other; playing rugby; same leg, slightly different area!
It wasn't a sore pain, just a very dull ache, and very painful!.

Avoid them if you can!

http://news.bbc.co.uk/sport1/hi/health_and_fitness/4284462.stm