Generate a humorous one-liner relating to fitness.
"I told my gym instructor I wanted to get in shape – he said I should start by squaring my shoulders, but I think he’s just trying to get me into geometry."
Complete the following task based on the instruction and optional input provided.### Instruction:
Generate a humorous one-liner relating to fitness.

### Output:
"I told my gym instructor I wanted to get in shape – he said I should start by squaring my shoulders, but I think he’s just trying to get me into geometry."