Odd feeling in left leg when I kick -

Does this happen if you sit with your legs straight out in front of you and your back straight and down (so your body forms an "L" shape)? How about if you lie on your back and raise the left leg off the ground? Do you get pain in your back at all when this happens? Anytime someone describes an "electric shock" type pain, I immediately think of a nerve issue. Given that only certain moves provoke it and given the very specific location, I would be most suspicious of something irritating the nerve that feeds that part of the body, probably an issue higher up in the lower back. Things to talk to your doctor about with respect to this problem would be a herniated disc, sciatica, or a tight piriformis muscle--all of which can affect the nerves that sense the legs. In the mean time, make sure you are keeping a straight back during exercises, lifting with the legs and not the back (ie, squat to pick something up, push up with your legs, rather than bending at the waist and straightening from there), and not overly extending your lower spine--remember to "tuck your butt in" when you are exercising to put less strain on the lower back. You can also try stretching the piriformis muscle before exercise. The easiest way I like to think of it is sit in a chair with good back support, cross one leg and rest your ankle on the opposite knee. Lean forward with a straight back until you feel a gentle stretch, hold there for a couple seconds, and release. This can also be done lying on the back, bending one leg so the foot rests on the ground and assume the same leg position with the other leg (ankle to knee) and pull your knee towards your chest until you feel a stretch. I would hold off on doing the provoking exercises until you speak to your doctor. Hope that helps!

The way you describe it as an "electric shock" makes it sound like a nerve issue. I get that occasionally in my right hip, mostly during extension exercise. My doctor told me it sounded like a nerve rubbing against a tendon the wrong way and that there was't much to be done about it but rest it when it gets bad. Losing weight should eventually help, too.