As always, if you’re male, exchange “he” for “she” and “girl” for boy/man/bloke/lad or whatever. If you want to put the verses you haven’t done yet into future tense, feel free. This one is to the tune of “This Old Man”.
This old girl, she ran one
And she found it lots of fun,
With a nick nack paddy wack,
Take my breath away,
I’m going to run C25k.
This old girl, she ran two,
Even with no fancy shoes,
With a nick nack etc
This old girl, she ran three,
See the throbbing in her knees,
With a nick nack etc
This old girl, she ran four,
Now she’s coming back for more,
With a nick nack etc
This old girl, she ran five,
And she’s feeling so alive,
With a nick nack etc.
Hope it helps ! 😄