So for this we have receptors called muscle and tendon spindles that specifically sense stretching.

为此，我们有称为肌肉和腱体，它们专门感知拉伸。

When we tap your, let's say your patellar tendon that causes a stretch in a muscle spindle, this sends a signal back to the sensory neuron, which activates a motor neuron in the spinal cord to cause your knee to kick up.

当我们敲击，比方说髌骨腱，它会导致肌肉纺锤体拉伸，这会向感觉神经信号，这会激活脊髓中运动神经，使膝盖抬起。

And that's the other thing is I found that my tendons feel better from doing the aerobic work, probably because I have a better blood supply.

而且我现我腱在做有氧运动后感觉更好，可能是因为我血液供应变好了。