The biggest point of stretcing to throw most varieties of kicks is the pelvic region.
Roundhouese kicks: pelvis, rear femoral
Straight snaps/thrusts: frontal femoral, rear femoral
Side thrusts/snaps: pelvis, rear femoral, front femoral
To stretch these areas I do the following:
Pelvis: american splits-done by stretching the legs out to the left and right as far as possible, even sliding forward on your ass with your heels planted helps stretch it further.
Rear Femoral: i don't know the proper name for this stretch, someone who does could help, it'd be nice to know what I'm doing...but you plant one foot as deep into your pelvis as you can while sitting down and stretch the other one out. Reach behind the ball of the stretched foot and pull it right off the ground about 1 inch. crawl your fingers down your foot as close to your heel as you can going over the top of your toes.
Frontal Femoral: chinese splits. these are done by placing one foot forward, he other behind and lowering down as low as possible with the arms on the ground on both sides for support and balance, the body in that position is very precarious.
If anyone has better ways to explain these please do so. I tried my best but upon rereading I realize some of that makes only meager sense.
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