hard surface causes knees to feal weak/numb

Question
QUESTION: Hi,

I am currently training for the army selection process and when i run on a hard surface (path/concreate) after about 2 mins my knees feel kind of numb/weak its a funny feeling to explane but it is slowing me down. Any advise

Thanks

Holly
ANSWER: Holly,

What is your age, weight, and prior exercise regimen?

---------- FOLLOW-UP ----------

QUESTION: Hey thanks for the reply,

I am 28, weight is 10 stone started up running only about 3 months ago, i am fine when i run in the woods even though there are a lot more hills, i still find it harder running on hard surfaces.


Answer
The body takes on more stress running on hard surfaces as the hard surface leads to more shocks from the pounding.Also, women's bones are most often softer than men's. This combination can easily lead to discomfort in the knees and shins. I would recommend running on soft surfaces, as well as making sure you get calcium for the bones. Over time, your body should adapt to the stress.

Ryan