I'm a teenager I do not get a lot of exercise due to knee problems, and for the last year or so have noticed numbness or tingling i'm not really sure which. At first it was just in my ankles when i was crouching, but recently almost any physical activity makes my ankles feel kind of numb tingling or weak and the other day i went rock climbing and wasn't able to climb like i used to because i could not hang onto the rocks with my arms for long and would have to let go. For the next day and a half or so my arms felt numb. now they are just sore. What I want to know is whether muscles get weak and numb when you get more exercise than usual or if they are just supposed to be sore.