My experience of the heel kick is if I don't lean back my upper body with my heel kick, my opponent's finger jab can still reach to my eyes.even if a shorter heel kick, is still way longer than any arm.
Which length is longer?
- arm length + hand length,
- leg length (without include the foot length)?
No too sure about this comparison. But I'm pretty sure that
arm length + hand length < leg length + foot length
because arm length < leg length, and hand length < foot length.