strain in left lower abdominal region

Hi I am experiencing a slight pull or strain above my left testicle area basically the triangular area just beneath the stomach on the left side..i do a lot of ellipticals and running evryday..it's not very painful but i do feel the strain when i walk.It does not bother much when i wear a supporter. what can it be the strain that is..only sumtymes the pain gets referred to the testicle.I have had a previous history of varicocele..But this looks more like a strain above my testicle area my muscle in the left region feels loose...what can it be and how do i strenghten the lower abdominal muscles and can I do mild exercise i.e ellipticals with a supporter.

[Caryopteris]

This article may address what's going on.

http://sportsmedicine.about.com/cs/hip_groin/a/hip2.htm