Come up with a pun based on the word 'tendon'.
Why was the muscle always upset? Because it had a lot of tendon-cies to be stressed out!
Complete the following task based on the instruction and optional input provided.### Instruction:
Come up with a pun based on the word 'tendon'.

### Output:
Why was the muscle always upset? Because it had a lot of tendon-cies to be stressed out!