How many have you gone though the kicking blues, right now I'm having a hard time getting my legs to coroperate with the rest of my body. the right leg is about ready for some great workouts but the left leg is keeping it back, it has been week and no power not even with the back and or sidekick. I have had this problem once before but it was so long ago I forgot how to work it out. Any and all help is appreciated.
I just fought through this, myself. I finally figured out what I was doing. It may help, it may not.
My timing was off on one side (my left, as well). Particularly round kicks and "hook kicks" or heel kicks. It felt like either my hip was going to come out of joint, or I was way off balance.
Just for some reason one day I re-arranged the natural timing on that side. For me, I was turning my hip over a split-second too soon, so I wasn't using the best muscles to lift my leg.
I had to lower the kick on my left side, and do it slow, until it felt natural and balanced. Then raise the kick up a little, and do it slow again. Keep raising it until it feels wrong. Then try doing things in different order. Try turning your hips over at different times during the kick, twist your foot at different times, watch your hands to see if you are throwing them around to keep your balance. Make sure your head is upright and that you are not looking down. Stuff like that. Experiment with your kick, and don't "force" an awkward movement.
After that, when you're warm, stretch! See if you can get a partner to help you -- stretch all kicking postitions, having someone lift your leg. It could very well be a tight muscle, and that's it!
Good luck with all that!