urinary leakage

I'm 17 years old. I have had this problem for about 3 years now and I finally want some help. Whenever I do things such as jump or run or other things that put stress on my bladder, I leak urine. This does not happen ALL the time. It usually only happens 2-3 hours after I urinate. I had a skateboarding injury a while ago that cut my scrotum (I'm not sure if this has anything to do with it.) Is this a serious problem? Any help would be greatly appreciated.

[tanu1]

Im 28 years old. I have had this problem for about 3-4 years now and I finally need some help. Whenever i do things such as jumping, running or lifting heavy things at that time I leak urine. It usually happens after I urinate. I want to know about this problem, Is this a serious problem? Your help would be greatly appreaciated.